There really is no solution other than a complete tear out. What you describe is so bad and so incorrect that I can only imagine how bad the work that is hidden will be. I imagine no presloped bed under the liner, no moisture barrier on the walls, possibly greenboard used on the walls, I envision the curb being formed by nailing cement board through the liner and guessing from the size of the shower, that this was possibly a tub conversion which would explain the drain placement. It can be done that way without moving the drain but creates for a really unsightly slope or creative layout and cutting, which your contractor is obviously incapable of doing. If this was a tub, often they are plumbed with 1.5" drain lines but a shower stall requires a 2" drain line all the way to and including it's connection to the plumbing stack. I picture a reducing fitting from 2" to 1.5" being used somewhere along the way.
Really, if you have any pictures taken during the construction phase and also current pictures, please either post them or provide a link to a personal web page or photo sharing site such as photobucket. There's a lot that we could probably figure out from those pictures and we could confirm all our worst concerns.
Do you have a bench in this shower and do you know how it was constructed?
Seriously, pictures, pictures, pictures.
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