Merlin Fourways poor customer service.

I bought an aluminum door (Exterior Door Aluminium with Frame (Prehung) Angle Pattern Bronze Reflective Glass Right Hand Opening Open-in-w1190x2090mm) a few weeks ago at Merlin Leroy Fourways. Door is not opening 2 ways as indented and it also grips. Went back to the store for advise and they told me a supplier will be in touch. Supplier did call and he initially advised he will send someone to come check out the door then later asked for a video. Video was sent and he then concluded door was not properly installed therefore he can't help. I'm not happy with how my case is being handled. I called the store back to lay another complain about the supplier and there's no feedback from the team. Could somebody please help resolve this as I have tried Facebook and sent emails to the Merlin SA team but no responses from there. I'm so frustrated with this lack of communication and poor service delivery.