Telkom *****ing Money

We cancelled our ADSL line with Telkom about 8 months ago to change over to LTE. Yet ever since we've been billed and Telkom deducts from our accounts for the suspended account as well as the new account. When I log into my online account it tells me the account in question is no longer in service. If I phone the call center they tell me they have no calls logged where we cancelled. Ref to references ********** 7 (February) AND ********** (March). So obviously Telkom doesn't really know what's going on then? I can't claim my money back because according to the call center the account is not active. HOW CAN I STOP PAYING FOR AN ACCOUNT WE SUSPENDED 8 MONTHS AGO PLEASE?