Major billing issues with Mytelnet

we have been with Mytelnet now for sometime and they have many many billing issues. we have been told that we are in arrears of R7000 in july again we made payment in july and in august we were told that we were now R8000+ in arrears. we have paid every month and even sent through proof of payments for all the months we have paid only to be told they would like to fetch their equipment. not sure how their billing department works or if it works at all. we have requested statements which we never receive. we are now at wits end.