Rain still debiting after cancelling

This doesn't deserve any star. Since taking the rain 5G. I have encountered so many issues. The after sales service is pathetic. I cancelled my plan on 18/12/2021 which was within the 7 day period for a refund because I did not get coverage in my area. It was an up and down battle to get my refund. Eventually I received my refund and they collected their router. However, today the 01/02/2022 I am still being debited from Rain for a service that has never been used.