Oasis Polymer Wall Movement

[aug3939]

I ordered a 12x24 oasis Do It Yourself kit from Kafko a few months ago. Spent quite a bit of time and effort on making sure everything was perfect. The problem that I experienced was after completing the install, it turned out that they sent me the wrong size liner. Unfortunately, it took them over a month to make a new one for me, and it that time period the polymer walls started to bow/move at the top (ground level) due to the summer heat (mid 90's). My question is...has anyone else had this problem , and if so, how do you go about fixing it. I've put a rig together with a hydralic jack to try to push the walls back out, but haven't tried it yet since I'm a little skeptical about it. Any help or suggestions would be appreciated. Thanks in advance.