Credit Record Mess-Up

I am very tired of fighting with Vodacom in order to get my credit record up to date! My account was in arrears many months ago and I paid in full and all was sorted on my record, then again (for a second time now) Vodacom says I am now 6 months in arrears on my credit record. But when I phone Vodacom my balance is at ZERO (I owe Vodacom nothing). I sent a mail to Legal Department and they just closed the case immediately, so I am tired of this no one can give me answers. After this months payment; I have 2 months left on my contract, please cancel for me immediately! And I am not paying a cancellation fee as you have done major damage to my credit record by fluctuating the arrears amount every single month.