************ business practices and NON existing service

I am a teacher - on 1 April 2020 I activated a Rain data sim card to use during lockdown for online teaching. I took out the sim card at the end of April. RAIN's service is to slow for online live streaming of classes and live meetings. They took money from my account for 0 Gb data use during May and June. After requesting ONLINE to effectively end my service on 1 July RAIN, AGAIN took money from my account for July. I am a teacher - I cannot spend money on a service I did not use. After ending the service RAIN is STILL taking money from my account. Their previous customer email address does not work any more. They do not respond to online queries and their previous customer phone number has a message saying that they cannot help you. I need RAIN to PLEASE refund my money.