Wrong billing

Good afternoon.

My name is Lineo Leqheku I'm requesting for your assistance regarding my vodacom account.

Email address: ***

I have wifi account with vodacom of which it was R599.99 per month but on July they deducted R1200 which I reversed to a point where it accumulated to R4800.00 and I have been sending vodacom emails to cancel the contract since we'll they're deducting more of what we agreed about. They it has affected my credit; I want them to give me a letter that clears my credit as I want to apply for mortgage.

Your assistance will really be appreciated

Regards Dineo Leqheku