Misleading Customer for Migration/Upgrade! Cheats!!!!

So i have been with Cell C for many years, i also have contracts for both myself and my husband, however whenever i did anything i always opted for going in store and getting it done because of the bull**** that happens over the phone. So my contract was ending last month and i was contacted by cell c to upgrade prior to this, i did advise them that my husband has already taken out a contract with MTN for me which gives me sufficient data, minutes , etc and that i wish to cancel my contract and not continue with this specific line but keep the other line as is, on my last conversation i spoke to a friendly lady whom i didnt think would be such a ****, upon asking her to cancel my contract and explaining the reason why she said she can give me data minutes and sms's at around R30 per month which was a good deal to me and she advised that it would be on top up, i agreed to that however now i am billed R1500, around R700 for my husbands line and around R300 for my line and almost R400 for the line that was supposed to be R30. This is misleading the customer and ***** as i did not agree to this and i confirmed multiple times with the consultant. I want the recording of this call and i am going to take this up to higher authorities as per the consumer rights , this is *****!!! i havent used this sim card for the past month and i want this contract cancelled i am not prepared to pay for something i did not use or agree to!!!