******* who ***** money for a cancelled subscription..... *****!

Cancelled my subscription in August 2021 and the Internet Service Provider is still taking money from my bank account on a monthly basis. I have made multiple telephonic attempts to the call centre to have this rectified and to receive the credit which is due to me, but each time I call I am promised that I will receive call backs which never happen and the credit to me is still outstanding. It now has a financial implication on my person, can anyone help me please. CAS 962362G5V7V6