Sounds like the door clips not the motor, it was an item that mk4's were recalled on if the broke.
My personal advice is don't buy the clip repair kits, I went through two, a right pain to fit and it was a temporary fix for me on both occasions for some reason, even my mechanic said they are a pain and he has had 50/50 results with them. Just buy a complete new runner panel for that door, think they are about £90, and easy to fit.