******* billing by Rain Network Provider

After reviewing my bank statements and rain monthly statements, I have realized that Rain had been debiting my bank account from Nov 2020 until Jun 2021 while I was not using their services/ sim card. Rain services are pay as you use and not contract. They are de*****ing the customers. How can I be debited for services that I didn't use? I want all ******* debits to be refunded back in my bank account. Regards SJ Makgoba