RAIN NEGLIGENT AND TERRIBLE SERVICE

I recently uploaded a review on this platform but out of desperation, need to upload another as I am frustratingly not getting anywhere with Rain. I will not retype the initial challenges however will insert the reference below. I concluded my last comms with Rain to request my service be cancelled asap. Twice I have had to drive to a seperate location to call them as they have rendered my cell sim unusable on both my and my 70 year old mom's cell (she lives alone by the way). I had to call twice as they continually try to call me to discuss my cancellation but are unable to do so as the sim doesnt work (due to their fault). I have requested to speak with a supervisor or manager but they do not allow me to do so. Apparantly they cant cancel my subscription online or on the live call and have to contact me back to do so?! I explained twice to the call centre agent when I called them that I urgently need to highlight that they can only communicate via email or Whatsapp as the sim doesnt work yet they still try to call! They then send an email stating they tried to call me unsuccessfully!!! They debited my account for another month yesterday despite me emailing and calling last week stating I want this service cancelled!!! Im in an endless loop of negligence and dont know what more to do other than fly to their office in Jhb to cancel my sub. Im left with my and my mom's cell numbers that dont work, No calls can be made or received, no otp's can be received to log in to accounts etc. PLEASE HEELLPP!!!! PLEASE HELP!!! I AM DESPERATE AT THIS POINT!