Bad Service Provider

My contract expired 26/08/2024. Call centre told me to write a letter stating that I do not want to renew the service and send it 1 month in advance. I send the letter 29/07/2024. Up to date Cell C still bill me and do not deduct the payments made from my account. The fast to hand you over to collecting attorneys. But where is the payment I made EFT ? You don't get statements from them. You have to beg them for statements. But they fast to call you to give you another contract when its time for your existing contract to come to an end. What a useless service provider. No signal in several places in and around my town. WILL NEVER EVER MAKE USE OF CELL C AGAIN .