VODACOM- SEND ZERO INVOICES AND HAND ME OVER TO DEBT COLLECTOR VVM

I had taken out a contract with Vodacom. They had assigned some other person's account to mine and debited my account for over R3000.00. I queried then and had numerous calls with different people to try and resolve this. I tried to put in my notice for cancellation and was told that my account is not up to date, YET I receive a zero invoice monthly! Now Vodacom hands me over to debt collectors with an absurd amount. I request all invoices and a statement. I receive a statement that has different invoice amounts for a PREPAID contract and more than one invoice for a single period. I send a full recon to the idiots at the VVM debt collection and until today have received no more communication other that I need to pay. I call and ask how have they come to the amount owed, they reply that they are unsure. How can you collect money when you are unsure of the amount? Different people call from VVM and all of them are unaware of previous communications what a load of nonsense. I received absolutely no communication from Vodacom to say that I was in arrears previously to them handing me to a debt collector, Now they want me to pay over R3000 again and cannot prove the amount. This is against the law and total *******! They have affected my credit rating which has never been defaulted before! I am going to approach the ombudsman as I am no fool and they have no grounds to cause negative credit on my record if they do not have facts and proof.

I need this sorted out ASAP VODACOM! I shall NEVER deal with you idiots again!