Ignoring my request to fix a mistake now I have issued with new order.

Months ago I ordered from Cherry Melon. Due to a incomplete order I was send a credit invoice. With my next order with agreement with Cherry Melon I only paid the balance owed to them. After explaining this to PayFast NUMEROUS times this situation is still a problem. Causing me to have problems with my new order. After a week still not receiving anything even though they advertise only two days.