Incorrect fee disclosure

The year 2016 I took contract with MTN. I was not given the correct information regarding the contract and the deductions. On my first installment, I was charged extra R600.00 of the initial agreement. I logged the query and was I was refunded. The contract ended 2018/06/31. Before the contract ended I was called for upgrade, which I did on the 07th of May 18. During onboarding I asked the service/sale consultant about the charges(I didn't want to pay for two phones) I was informed that I will only pay for one contract as the new one will kick in the month end of June. I was also told that I will receive contract with T&C and also fee explanations. The only fee was disclosed to me was once off initiation fee. I never received none of these. I received a message that my account will be debited for an amount of R758.00. My current contract is only R299.00. I logged a quire and before anyone can reply to me, services were terminated from my phone. I was told to pay an amount of R389.00 to Absa account before my services can be reinstalled. I paid the amount and I received communication that they are looking into my query is being addressed and someone will be in contact with me. Since I waited no one came back to me. Yesterday I received another SMS informing me that my account will be debited for an amount of R754.00. I never missed any installment from the inception of my contract with MTN. After what happened on my first interaction with MTN, I was irate and regret why I changed from my previous network provider to MTN. But I put that behind and continue my relationship with MTN. The same thing that happened in the beginning is happening again. Please can someone sort this out.