Corotech Garage doors Randburg

I am an installer and have been working very well ,buying from this company up until I received funding from Sedfa, they paid R91 000 into Corotech's bank account and since then Corotech has delivered Reject doors and they refuse to take responsibility, they expect me to bring their doors back at my expense and back and It is not promising because they might just give me more reject doors since I am far. I managed to sell a few and gave discounts to clients but these doors are bad. The panels colours are not the same and some have ink spills on them. It was very disappointing because I have been buying from them for over 4 years. Some are even written Reject on the panels itself and have been trying to make plans with Corotech to fix this issues but they feel that it is not their problem. Being a small business probably makes them believe they can take advantage. I have to pay sedfa back each month for reject doors that are stuck in my house. Disappointing!!