Cell C has gone rogue

After countless contracts with Cell C, they have gone rogue. I bought a new contract phone with Cell C on the 15 September, as usual service was beautiful until 2 days later I tried to use the phone but the speaker and microphone was bad. Attempted to use it again but the problem persisted so on the 8 the day I took it back. They booked it in, then 3 weeks later, phone comes back with the same issues. I leave it in store, complaint, then now on Monday I get a call that I can get another phone (same make) or cancel the contract. I decided to cancel as I don’t trust the make anymore now Cell C says that I must still pay for the previous contract which hasn’t debited yet, even though the money won’t be paid to the new contract but it must just go through for nothing. I’m talking about over a thousand that way claim I must make it for a contract I didn’t even use 10% of but I must just allow even though my debit date is still 12 days away. Like