TELKOM AGCS VVM what's going on

Hi my account was handed over and I gave been paying AGCS every month without fail. However today I received a call from VVM saying my account is in arrears and I need to make a payment arrangement they say according to their system the last time I paid was in April however I have been paying AGS and my last payment was in June I am very confused as this all seems like one big **** What happened to AGCS calls are going unanswered I want them to refund my money and I need clarification on what is going on I also want you to be aware that your customers are bieng ****med