it is possible to fix that wrinkle on the door panel
ive seen it not too long ago. but it goes like this..
remove door panel
if you look at the back, you'll see little holes. take a dremel with a roto zip drill bit and carefully make the holes a little bit bigger where the wrinkles are. BE CAREFUL NOT TO GO ALL THE WAY THROUGH!!
spray some 3M or better adhesive thru the holes
press down on the vinyl and dry with heat gun
id rather use some fiberglass resin or something stronger than some spray adhesive tho