Cell C worst customer service ever!

I am at my wits ends with Cell C. Here is my experience. I took out a contract for my Mom with Cell C in May 2016. Close to the time that the contract was to come to an end I went to a Cell C shop to enquire about upgrades etc. I was told this contract was migrated to GloCell. So off I went. The original contract expired on 17 May 2018. All of a sudden in July 2018 Cell C goes and debits my bank account for this contract. Very confused I return the debit order. Back and forth to no avail I have to keep remembering each month to return the debit order as I am not getting any constructive response from Customer Services. In July 2020 I then get a letter of demand from attorneys for this contract. I start asking for copies of the contract etc from both the attorneys and Cell C. Only to be told they don't have a copy and I may gave done it over the phone. No I did not! I ask for a Statement on this account and I receive something that looks like a excel spreadsheet with a shoddy Cell C logo pasted on it. Now remember the attorneys in the background. They call you almost every day to demand settlement. This is very traumatizing. I then receive a 'Confirmation of contract' from Cell C. No mention that this contract moved over to GloCell. Oh yes, the statement Cell C sends me also indicates the periods that GloCell was debiting my account. So, I am still being harassed by the attorneys for payment and CellC is not communicating with me. Does not help to send email or even go to their regioinal offices as no assistance is received. What do I do? Continue to pay for a contract that ended in 2018. Pay the settlement amount of almost R600 for a R90 a month contract. CELL C IS THE WORST!