Telkom Mobile *******ly continuing to deduct debit orders for cancelled service

I had a mobile LTE contract which expired earlier in 2021. I REPEATEDLY tried to cancel the contract, and when I say repeatedly, I have phoned them, emailed them, SMSed them and attempted to do so on their useless web site.

Still, every month, they are *******ly deducting the debit order from my bank account. I am at the point of suing them.