irritating

Vodacom delected my numbers without proper communication ,for my surprise I'm now in arrears for 6500 I don't understand where arrears are coming from as I have been paying my account .can someone explain to me were is the 6500 coming from and how many months did I skip payment .what is the monthly instalment on each contract. I'm currently applying for car finance and they can't approve me because Vodacom show that I'm in 6500 arrears my cell phone account .can someone assist urgently as this is not what we agreed on in our previous discussions