Patio Enclosures Placed indoor molding on the outside of house on patio doors. Turned yellow. Company will not make it right Marietta, Georgia

Patio Enclosures installed new sliding glass doors in our dining room and living room.  We found out the installers used indoor molding on the outside framing of the doors.  The molding on the outside of the house has turned a bright yellow which looks horrible with all the white on the doors.

I spoke with the original sales person at the home show last year about the yellowing of the outdoor molding and he stated "that should not have happened" and was going to have someone come out to look at the doors.  The home visit or even a phone call never happened.

I called Patio Enclosures to have someone come out and do the correction on the outdoor moldings and was told "it would not be them".  Patio Enclosures was bought by another company and that company will not provide any service on work done by the previous owners.  

The company has the same name and the same manager as with the previous owner.  This company needs to make their work "right".