Removing wrinkles in vinyl liner, in-ground pools

Anyone a pro at this?  I have a 2-year old in-ground pool that developed some wrinkles on the shallow end of the pool shortly after the pool was installed.  The pool installer said it was due to ground table water.  I installed a drainage system all the way around the pool last summer.  We've had a couple large storms recently (over 6" of rain in under an hour), which did not result in a floating liner.  The pool company came out, drained the shallow end of my pool and tried the plunger trick.  They were walking on the liner, pulling and plunging and were unable to remove the wrinkles.  Anyhow,  would it not make sense just to pull the liner up and pull the wrinkles out that way, or?  There's one on the side they absolutely could have done doing this.
Thanks,
John