Cell C lacks integrity - be warned before taking a contract

I had a contract with Cell C which was meant to come to an end on the 07th Sept 2024. I called in June to cancel when I received an sms & calls offering me an upgrade. I made it specifically clear that I will NOT be continuing with the service after my contract expiry date. I called again on the 8th August as they had said it was too early to cancel in June and I must call to cancel giving exactly a month notice (still weird), but nonetheless I comp**** and called on the 8th August & received an sms confirming the cancellation on this day, 25th September and 25th Oct I still had my bank account debited unauthorised by Cell C & the credit Bureau being fed incorrect information that I am owing. I have called the Cell C call centre & am being sent from pillar to post without any assistance, last lady I shared the cancellation sms with promised to call back and to this day nothing. In all my days of having a contract with Cell C, I have never missed a payment & now that I didn’t want to upgrade they are tarnishing my credit record with lies and not admitting the error on their end. Spent a lot of money on calls to them to get this resolved, I need it resolved and will go the ombudsman route if we have to. Think twice before dealing with Cell C or taking out any contract with them, they lack integrity.