Phantom Arrears

I have contacted DSTV 3 times regarding so called "arrears" on my DSTV account. Every time I have contacted them they say they will refer the matter to billing for investigation and will get back to me. I have already received phone calls from attorneys trying to collect on these arrears. I DONT have a contract with DSTV. I own my decoder and dish free and clear. I run on a pay to view with them, i.e. no pay, no watch tv!! So explain to me HOW CAN I BE IN ARREARS????????? Billing department does not have any telephones and only communicates via email with the call centre. Can somebody please help me with this issue please???? Its getting ridiculous now!!