Rain 5G home router

I have cancelled my subscription with Rain in May 2025, however every month they keep trying to debit my account. I am sitting on a minus as they try 3 times in a month to debit. They have said several times that they are escalating the matter but month to month they still try to debit then leaving my unused account into a minus. I owe R34 now on the bank just for Rain debit attempt.

Kindly assist with this, I keep fighting them and I get same feedback. I have conversation between us.

This is really unacceptable of them. I last used their router in April and notifying them to collect it and cancel the subscription as well.