Super-pathetic-sonic threatening me over 9 month closed account.

If I could give negative stars, I would. So I cancelled my service in October 2024. Ticket shows as COMPLETED (ticket SST486373). And got a threatening SMS today saying they confirm the account is cancelled (sms about 9 MONTHS after the fact) but a balance is owing. That after they forced through more debit orders, eventually forcing me to close my bank account to stop them *****ing my money. Now they threaten with final notice for payment, etc. Pathetic service, and I would steer everyone I know well clear of Super-Pathetic-Sonic.