Statements received wrong and account in arear. ******!!!

Opened and account with Ackermans Mei/June of this year. We received the first statement on the 15 of June mentioned that R 0.00 is due. Then no payments was made because the statement indicate no payment. On the 30th of July we received an statement of R 120.00 and we made the payment on the 3rd of August. We just received a call from the accounts department from this lady that doesn't even give you time to speak. From what i understand the payment of R 120 is received but not loaded as yet. But want us to pay R301 that is outstanding. When my husband ask her but why is my account in arears she mentioned that an payment was missed. According to the correspondence statements that i can send you there is no indication that the account is in arears. When my husband tried to explained to her but we pay according to the statements received. The account can't be in arears as we did made the payments. She wants us to pay the R301 now but the R120 is not even allocated to my account. But need to pay the august outstanding amount as well. But new statement has not even received so who is pocketing my money that we are paying and how can i pay for August if it is not even the end of the month. You look like ******. And if you can't do your work don't come and bother me with the problem that your system has a fault. Sort out your mess. Payment will be made when the statement for August has been received, When my husband asked her for the reference of the call she didn't want to give it only said she will send sms. But then she send the amount outstanding with banking details on it. So i don't understand how we can be in arears if we pay according to statements received, And before you phone get your facts straight first.