We had wrinkles in the shallow end of our pool last year as a result of excessive rainfall soaking into the ground and floating the liner. After waiting a month or so to make sure the ground had plenty of time to dry out, we drained the pool until the shallow end was dry, putting a couple of sandbags in the corners to keep the liner from slipping once the weight of the water was off of it. Got on our hands and knees and slowly pushed, rubbed, slid, shoved, cajoled and cussed the liner back into position. We used a vacuum to hold the liner in position along the wall and then refilled the pool. It wasn't an easy or fun job by any means but it worked fine and the pool looks like new.
You might check with your pool builder and see how much they would charge if you do the draining, help them with the liner placement and refill. If you can do the bulk of the time consuming work and they don't have to be there more than a couple of hours they may not charge much.