Please help me vodacom is frustrating me.

Hello Peter pls do help me with this stressful issue I have to deal with every month end. I did open a contract with vodacom, a top up one meaning whatever the data n airtime they give me once its used up I must recharge, okay so this phone I needed it for my son's school work so it will be easier for him to do his research for homework and other studies. Then I paid several months the agreed premium, then four months back the premium escalated from R385, 00 to +-R1200 . Then I went to the shop to query the sudden rise of premium so they told me some data was being subscribed so then I asked how since this is a top up contract they said its possible then I asked them to sell me another pre paid so I can stop the contract one from being used and pay the extra money over a four months period and also I requested that the simcard be suspended, okay then the consultant said she can convert the simcard into pre paid so long then I agreed to that, but I did still buy the pre paid for my son then I used the converted into prepaid one, month end came then amount is being overcharged again I called them again then the consultant said the other consultant that was helping me did open the contract again instead of making pre paid then I asked the airtime that I was buying where was it going. Okay then I asked him pls do suspend this simcard completely so I can pay what its in areas n start a fresh he agreed n said he did, but come month end its way too much, vodacom debited my account R3582. 45 I went to the branch in keywest where I opened the contract the manager checked into the system and found the amount of R1088. 00 that I was supposed to pay but I asked her how is this possible since the sim card is being suspended, and I asked her to pls check my account transactions so I can prove to her that the sim card never worked, she said it's impossible for her to see the only thing she can do is write an email, so they can help me n she promised me that I will receive a call from vodacom of which I never did please do help before vodacom destroys my credit record.