False advertising and bad service

On the 13th October i received a call from Cell C advertising their promotion Sim card with 10 gigabites for the price of R99. 98 per month and i was interested and they sent me 2 sim cards with 2.500 gigabites day and 2.500giga night datas on the other sim they also put the same as the other sim Not knowing i thought it was supposed to be like that and i was told the first instalment ofR99. 98 per month and i will start paying at the end of November but only to find that on the 1st of November i received a bank notification that Cell. C demanded R346 and they did not find the funds on my accont as they had told me the debit will be on the end of November. I called Cell C to enquire about the transection they said it does not show on their screen. On the 15th November i received another bank notification that Cell C demandedR927. I called Cell C to enquired about this demand i was told that they sent me 2 sim cards each comes with the prorata and the amount of money for the data is not R99. 98 anymore I told them i only requested only 1 sim card they said i shouldn't have used both sim cards and i explained to them that i thought the sim cards were for the 10 gigabites that they promised me Iwas also told that i used the data to call and i borrowed the wattsapp bundles that i did not and it all came to that total ofR927 itried all the means to talk with them and requested to cancell my contract and i was told it will be cancelled after 30 days and on the 28th they were supposed to debit for the old contract that I've been paying for the past 1year 8months was not debited on the 29th i called CellC to debit the money since i was afraid their going to barr my phone they did not debit n i kept calling them to debit the money they eventualy debitedR927 after5 days calling them. On the 15th again i received a bank statement saying they demandedR669. 42 n did not receive the funds as i had called them to keep debiting on the 28th I called them again asking now what is R669 for because i was told the 1st transaction was forthe2 sim cards the prorata tax etc. They told me its the money for charging for not finding the funds on those dates they demanded the funds on my account and was speaking to the manager by the name of Moses Mo***eng after threatning them he told me he will reduce the money toR445 and the money will be debited on the 28th December n should not use all the data that i was left with on my phone but i told him that is the data that i had payed for. I was left with 10 gigabites day and 10 giganite on the 1 phone and 500+-on the other sim day n10giganite I received a bank notification again on the 15th a different story from the one Moses promised me to do and the money was not enough in my account i was again charged by the bank for insuficient funds and I'm request help from you to help me with this matter