Poor workmanship and no customer service

Global made and installed a double door with windows on Tuesday 10 November 2021 which unfortunately has been paid in full. It is the worst workmanship I have ever had, they get 1 star for the fact that the doors did arrive. Struggling to get someone to return to resolve the issue. The door is not only poorly fitted but opens and closes with difficulty, top and bottom latch do not work simultaneously. Would still be Ok if the owner acknowledges to the problem and resolves it. Would not use them again and certainly never recommend them to anyone