Mobile Contracts

I bought 2 phones on contract on the 2nd of August at Telkom shop in Somerset Mall. I chose debit order as my method of payment. I was told i would be charged pro rata for the first month, so I would pay for August and September together, I also requested a limit block on both numbers. September came and I had still not received my bill eventually after me having to phone Telkom three times and agent emailed me my bill on the 7th September. Where I saw my bill was 1420.11 for the one contract due by 5th October number and R939.31 for the second one, due by 5th October my first bill was almost R500 over what i'm suppose to be charged. When I queried my account, I was given some nonsense story from the agent about over usage of data, even though I requested a limit spend block on both numbers on the 4th August! it is now October 5th and the money has still not been debited from my account again I have phoned Telkom and was told by the agent that my account is two months in arrears, that I haven't paid. How am I in arrears if Telkom is suppose to debit my account and just has not bothered? Then I was emailed Octobers bills today due for 6th November the one bill is now R1889.11 and the second one is R1408.31. So please em=xplain to me what the hell is going on with my Telkom bills? Why don't i get my bills until I request them? Why have i been overcharged by R500 when I requested a limit spend block? and why has my account not been debited for the monthly bills?

I want my accounted to be sorted out, i'm not going to go through this nonsense every month or i'll rather just cancel these contracts all together!