Unauthorised Deductions

I've got a new contract with Telkom Mobile last month. Asher numerous conversations with Lambert regards my previous account, it was established that my previous phone was faulty and my account had to be cancelled and a new one opened. I was told that my account was at zero balance and I would not be billed for any data used because of the faulty phone. Then I for billed over 800 last month for a phone I no longer had. So after a long discussion last week with a person at telkom mobile, named Sifiso, I was told that this was an error and it will be a credit in future billing, with my next bill this month being deducted from the credit. So I was told that considering my monthly subscription vs my credit available on the system, I will only have a deduction again at the ebbs is December. I was happy this was cleated up with them. However this morning, I received notification that 2 months subs were deducted from my account. This is unacceptable! They have abused the privilege I have geocentric of a debit order deduction this is not ethical. I want an answer and a credit to my account. Telkom Mobile are not conducting an ethical business if they tell a client one thing and do deif