EXCESSIVE DATA DEBITED TO MY ACCOUNT.

Having a problem with my vodacom account since July 2013, various phone calls to their accounts department and various letters to the accounts department without any response and the service been terminated from their side due to i didn't pay until problem resolved. Now after 23 months i receive a Attorneys letter stating i have to pay to avoid legal action ?? I have fax receipts that letters was received and registered letters sent to vodacom, they not interested in resolving a problem they only interested in money. As i looked into the matter i saw that there are many problems same like mine and unhappy customers. 1.) I asked for a detailed statement to see how they get to the amount- Their response first pay the account?? 2.) Spoke to various staff at the ***** department told me the sim card was \cloned". When call-in they remind you that the call is recorded for security purposes"