Stop attempting to take money from my account!!

I stopped using rain a last year when I moved from Durban to Gauteng. I cancelled the contract and the router was collected by the company on the 23rd June 2025. But rain is still billing my account and causing bank charges for each declined charge on my bank account. Who is going to pay for those bank charges. Why are you still charging my account when you have collected your router. I want compensation for the bank charges I have incurred cause I don’t understand why I’m still being charged!!!!!!!