Harassment, theft and poor service delivery

I normally pay +- R380pm I have free minutes and monitor my data usage to ensure I always top up on data to avoid 'out of bundle rates'. Last month Vodacom tried to debit R1170 from my account and the debit order bounced (I had to pay R120 for that). I am being phoned 2 to 3 times a day by the ***7 number to ask for payment arrangements. This is a computerised phone call with no option to speak to an operator. I phoned them and explained that I first what to see what I am being billed for before paying this amount. I paid R70.10 for once off itemised billing which I was told would be mailed to me within 24 hours. It has been 5 days and I still have not received my itemised billing that I paid for yet I am being phoned ALL THE TIME by this computerised number. I feel that this is a for of harassment as I cannot SPEAK to anyone on that line or EXPLAIN...murphy's law, I AM BUSY RECEIVING ANOTHER CALL FROM THIS NUMBER WHILEST WRITING THIS!!! I will NOT pay Vodacom a cent before receiving an official apology and my itemised billing that I paid for.