That’s actually happened to my frame. The clamp has bent the top of the frame in, and it’s visibly indented around in a circle…
I can still get the seatpost out though.
as an absolute last resort, you can cut the seatpost off at the frame line and drill out the remainder of the seatpost tube with an electric drill to clean it up. You might be able to use one size smaller seatpost after that or you might be able to completely clean it up if you take your time and drill it out carefully.
That would make for an interesting fall if the seatpost suddenly released. Interesting and painful. 
I leave for 6 hours to go on a muni ride and no one is able to answer a simple question. 
Sheldon “Unggggghhh!” Brown has the answer: 15 Ways To Unstick a Seatpost
If it is a steel seatpost in a steel frame then use penetrating oil and let the penetrating oil soak in.
If it is a steel seatpost in an aluminum frame (or an aluminum seatpost in a steel frame) then try ammonia instead of penetrating oil.
There are 13 more tricks in the list if those two don’t work.
You could do what we did at work once. Drill a hole through the seat post (the bit attached to the saddle, NOT the frame - which is called the seat tube) so that it goes through both sides.
Get a long screw driver through the holes you just made and use the extra leverage you’ve got to twist the seat post in the frame, till is starts to move.
Do you know what the post is made out of?
The seatpost that comes on the Qu-ax is steel.
Just wondering cause he didn’t state if it was the stock post or a possible different one the seller put or had in there.
If it is the stock post though, id do what JC and Sheldon say with the Penetrating oil.
my coker seat post has been rusted in place since last winter. I’ve tried everything in this thread at least once, and at the end of it all I ended up just wearing thinner or thicker shoes depending on how tall I wanted my seat to feel 
Ok here’s what I’m going to try, and I think maybe someone already suggested something along these lines; Remove saddle and substitute about a 2-3’ long piece of 2x4 and bolt securely to the seat post. Secure the frame as much as possible. Oh, I also have a heat gun I will use just prior to my loosening attempt
Twist the 2x4 until it frees up. I think this will work as I will have much more leverage than just trying to grab and twist the saddle. I have also sprayed the area with penetrating oil and I’m letting it sit for about 24 hours. If this fails, I give up haha!
After I broke the bracket off my QU-AX seatpost i had to put my frame in a vice and use a pipe wrench to get the end of the post out of the frame. I think it was because it was a knurled post because it wasn’t rusted at all. The new post was also very tough to get in, so I think the QU-AX seat-tubes are tight fitting to begin with. If you plan on reusing the post ofter taking it out, DO NOT use this method as it will trash the post completely.
I think Mr. Brown knows his stuff
Have you checked out Sheldon Borwn’s article on un-stucking a seatpost?
He has a verry good site and it has helped me with many issues, both bike and uni related.
can I have it if you give up?
Well, the saddle height is a tad low for me, but then again I can learn sif with it! No seriously, you can check out the thread in the trading post to see what I decided to do with the uni, but i just wish I’d thought to check the seat before I bought it…but then again I prolly still would have bought it, thinking I could easily fix it!
About the 5th post down
actually if u ride it, ride it without the seatclamp in place. And with time you might get lucky and it’ll pop out or move…
Fixed!
FIXED! Finally got it out using a 2’ section of 2x4 in place of the saddle for leverage. It took so much to get it loose that the heavy lag bolts I had it attached to gave way through the 2x4 just as began to turn! egan So I retightened the bolts and slowly but surely twisted it out. I think I know why it got stuck in the first place.
The previous owner wanted the seat lower (it’s never been cut down!) so instead of cutting it, he pushed the seat as low as he could get it, to the point where it’s not supposed to go because at the very lowest point, it’s apparently “tapered” somewhat as an indiaction of where to stop so it won’t go through and the tire!
It seems to be so because the seat post goes in/out very easily down to about 6", then get’s hard to go further. So he must’ve judt jammed it in too far causing it to get stuck; and man was it stuck!
here she is, a little paint removed from the seat post to make sure it fits great, but solid as a rock!
shes a beuty. Haha. Looks nice…
Yeah not to shabby for $120!