upgrade nightmare! to sim only.

my line was due for upgrade, i decided to opt for a sim only as per brochure which was R579PM for 1000 mins and 23GB date per month X 24. come the 14th of the month i didnt get these allowances and only got 500min and 3 GB data. i was told that i am not a business customer so i wont get the additional free allowance of 500 mins and 20gb data. i was promised this when upgrading and now they have changed their minds and told i can take this business sim. i have tried contacting the mtn customer services and they have no idea what i am talking about and cant even look at their own leaflet, i was given reference number SMC ********** 6715 which no one can trace on their side, as a customer with 5 lines i urge someone to look into this with a matter of urgency and give me the allowances that are due as per agreed. the call center is utterly useless and has no idea what is going on. how can you cancel on me but if i wanted to cancel it would be a complete other story.