********** contract added to my account

I received my invoice for April. My invoice is suddenly R2130 vs R190 for the previous months. When I had a look, I saw a new contract, a new, data bundle and airtime was added to my account, which I never authorized. I submitted an affidavit, proof of residence and certified copy of my ID to Telkom, as they requested, but I have not received any feedback or reply regarding this issue. My debit order is going to go off soon and I know if they debit my aacount with the invoice amount, I will never be able to get my money back from them. Also, I suspect that some of their sales staff are leaking one's FICA question answer to friends, because there is no other way that someone would've been able to add things to my accoubt without my consent.