Can't cancel airtime account. I've tried multiple times but Edgars doesn't want to cancel my airtime account

I've tried so many times already to cancel my airtime account with Edgars. I phone the call centre and they said that someone will contact me within 24hrs confirming the cancellation. That was 2 weeks ago, I'm still receiving airtime and still being charged.

Edgars always phones wanting me to pay the account yet this airtime contract is what is increasing my balance every month. It isso frustrating. Today I called the call centre and theres no answer.