Vodacom

I had a contract cellphone with vodacom fisrt 3 months i had give them a call every monthend because they were debiting in the wrong account.My account was then forwarded to the debtors collectors who never experienced a problem with my account...27 months later debtors collector is still debting money from my account,had it reversed and they gave me call,i asked for the statement never heard from them again.Went vodacom to request a letter of settlement which their customer service is terrible,got the letter and it stated "that after 7 working days my name will cleared".