I HAVE CANCELLED THIS ACCOUNT LAST YEAR

I have emailed and called and even went into the store and CANCELLED my account with Telkom and STILL I am receiving invoices and now you say you are sending my information to your attorneys. This is unacceptable as I have cancelled this account already last year!! Can someone please let me know what I can do to sort this out so that my name is not dragged through the mud as it is not my fault and it is Telkom`s.