UNAUTHORISING DEBITS ON MY ACCOUNT-NOT RECEIVING DATA THAT I AM PAYING FOR

I have taken out a 2 year, 10G (5day, 5 night) fixed data contract with Telkom in 2018 for an amount of R140.29. All was going well when I paid only R140.29 each month until Oct 2019 when my account suddenly went up to R640.29. When enquiring with Telkom I was told that someone had changed my spend limit to R500.00 on my account, hence the account was allowed to go over by R500.00 I disputed this as when I took the contract I was assured by the consultant at Westwood mall that my account will not go over by this amount. I was told should my data be finished then I will not be able to connect which was the case. This was also written on the contract documents that was signed. Telkom debited me the R640.29 which I asked my bank to reverse. Telkom re-debited me in December and I then let the debit go through as the bank could not reverse the transaction. By this time is was already frustrated and pushed from pillar to post with managers at the call centre. At this stage I managed to have my spend limit changed to R0.00 which was confirmed to me on the 01/11/2019. For the months of Jan'20 and Feb'20 my account ran as normal. In March'20, I received an sms stating that my account has been suspended again due to collection. On contacting Telkom on the 25/03/2020 and speaking to a person with the e-mail address ***, I was told that my debit order was unpaid hence the account being suspended. She asked me to send her proof my bank statement showing that the debit order was not unpaid which I sent to her immediately. She was going to send this info to the billing department which I assume she did not do. My debit order went through on the 31/03/2020 for an amount of R141.29 and increase of R1.00. On the 16/04/2020 I suddenly get another debit off my account by Telkom for an amount of R984.00. When looking back at my statement (see attached) they have gone back and debited me for the R640.29 + an additional R202.70 "Account subscription & once-off charges). I am sorry but this is not acceptable. From Jan till now I also did not receive the 10G data which I have being paying for. My line is constantly suspended. On the 02/04/2020 after my debit order of R141.29 went through my account on 31/03/2020 we get an sms stating "Hello!You have 9997MB "Telkom Mobile Data"available. 0MG will expire on 01/05/2020" It is no fair and very frustrating as Telkom has access to our bank account and they are just debiting us with amount which we have not agreed to and we are not getting what we are paying for.