Unhappy client

I joined Avon early this year and everything went well until the lockdown in SA in March. When I resumed work in June 2020 I started ordering again as I would be able to sell to my customers again. I received my product paid it off on July 2020 the 9th & 15th, I made another order for July and I received a message "YOUR AVON ORDER WWW028177 OF R1186.91 ON A/C .................. IS ON HOLD. PLEASE PREPAY THE AMOUNT OF R2283.93" I asked how because I did pay the R3516.03 that I owed for June 2020, there's is no response when every time I place an order I get the same message. The problem is that I can't order and sell to my customers because of the false accusation. My credit score is getting low due to that and no one is willing to help resolve the problem. I have proof of payment and the dates I paid. Can Peter please help me clear my name on this because I am a bad person to my customers as I don't deliver but give them excuses every time they need something. Please help me.