Impossible to get hold of someone at Supersonic

I sent a mail to Supersonic on 27 Sep, 28 Sep and 01 Oct, to cancel my fibre package at the end of Oct and asked for confirmation that it will be done and that my account wont be debited again from November.

To date, no confirmation email or phone call received. I gave them more than a calendar month notice already. The plan was to get a quote from them again once I moved into my new house, but with service like this, I wont be using them again