Constant Debit orders on my bank account after my contract was cancelled 5 months ago!

I have been having issues with cell c fibre to home for 5 months straight now. I cancelled their contract about 6 months ago and till now they still deducting a lot of money from my account. They have just deducted R2345.00 from my account just yesterday. I have escalated the issue more than 3 times now and all i get is a message saying someone will attend my issue then no one gets back to me. My ticket number is CF089104 and Kgosi Mokhine is the person who initially said the issue was solved 4 months ago. I have been trying to contact him and the support team on numerous occasions via email and over the phone but with no success. This is absolutely terrible service, the worst i have ever gotten in my life!