RSAWEB keeps charging our account after 5 months of cancellation

RSAWeb keeps charging me after I cancelled more than 5 months ago. After cancelling my fibre I keep getting billed month after month. We have requested the cancellation of the service 13 April 2026. But no-one even responded to this mail. I have contacted support at least 3 times at this point and keep on hearing it will be addressed. So it's either incompetence or simply a big money making scheme. I would've previously recommend RSAWeb, but this incompetend behaviour is totally unacceptable. Who will be refunding my cancellation charges at the bank as every time you guys bill more and change the reference number so the bank has to allow it through.