Rain debited my account after cancelation.

I have requested to cancel my Rain 5G in December 2022 and this has still not been cancelled, My account has been debited and not refunded and the call Centre refuses to pick up any calls, I demand a refund of the funds debited for a service I had not used. Absolutely appalled by the service provided as I had called in and the agent had said the cancelation will be done at the end of the month yet I was debited. this is unacceptable to take money for a service which was not provided/consumed.