Wrong billing

I took a contract in November black Friday a R199 contract, sales said they have to do a test debit and debited my account 28 November 2017 with R199, they said it will be credited to my contract and will be accounted for on my bill when I start paying. I only received my phone in December the week of the 11th. So now I get an invoice of an amount that is more then it should be, my R199 which they debited is not accounted for, when I call telkom the lady I spoke to Nonkululeko is not even explaining sense to me. Telling me I should call sales department to tell me where is my R199, before that she tells me it'll the 5 months for my R199 to reflect on telkoms system, and no one bothered to tell me that nonsense when i app**** for the contract. I hate being **** to, now the story changes because I already took the contract. December prorata and my R199 my bill this month has to be less the R366. Telkom fix this toe or take your phone. I won't pay R366 there is no way calculate correctly December prorata, January minus my R199 then that's my bill.