Help with basement wall insulation
The correct way to insulate a basement wall is with rigid foam or spray foam right up against the masonry walls, with air sealing scrupulously done with caulk, tape, and more spray foam, to make sure that no humid air can touch the masonry walls. Once that's done, you can safely build a framed wall covered in drywall if you like to finish the space. There should NEVER be poly in this wall sandwich, as it will trap water and cause everything touching it to get wet.

If you currently have a wall that has poly anywhere in it, you need to remove it. Then redo it according to the above description.