A frustrated customer

I have over 3 months with my Makro RCS store card, I have made two payments last month one via eft and other in store but to my surprise even today my eft payment apparently ain’t appearing on their system only the store payment is appearing so they say. So with all of that I was called and told that my account is in arrears and that I have a certain amount I need to pay this month fine,so I made a payment last week Thursday and till today m still getting calls that my account hasn’t been payed,I have been sending proof of payments and nothing is still being done,I even sent bank statements to show that the money left my account. M really frustrated and getting annoyed about the calls whereas I made the payments.