Shocking service

I cancelled my sim in the middle of March with a confirmation sms from Rain acknowledging the cancellation but I have been charged in full for June and now July. I have sent 2 email requests querying the charges, again with confirmation of receipt emails but no contact at all from Rain. This seems to be a regular pattern with them as it’s the second time I have been charged for a cancellation. The last time because the refund would take such a long time and because I had another active sim I agreed to a credit but this practice of charging for a service that has been cancelled and then making customers wait for their refund is unacceptable never mind the complete lack of response.