Bad service with no feedback

I have send emails and opened enquiry on the rain app to change owner ship of a sim that was used by my previous employer when i resign from last year December 2023. Till now no feedback not even when i asked how to cancle the sim card. Last week Thursday and Friday i was phoned by a agent of rain so he said. He told le i owe rain more than a R1000. I advised him about the problem and asked a manager to phone me back. As per my understanding if you don't pay you don't have internet and it is on a month to month basis. And i have requested change ir cancel. If i can get help regarding this problem.

Regards Annemarie