I am very disgusted with Telkom service

It was a big mistake for me to get a contract with Telkom, this was my first and last contract with Telkom. I am very disappointed. I logged a ticket but no-one got back to me to fix the fault. I updated banking details and I didn't get debited from the updated bank details. On top of that I got charged for bounced debit orders. I cancelled a contract and I didn’t get an acknowledgement email back to confirm that they received my email and to also confirm that my contract has been cancelled. I am very disgusted by Telkom service