Poor customer service

Disgusting service ever!!!!! poor network coverage, poor customer service, *********** staff. on the 15th of August 2018, i sent an e-mail informing Telkom of the change of bank account. they debited my old bank account of which had closed. Trying calling them due to the poor network coverage could not go through. I spoke to the supervisor Ms Thusi/Thusini 13 days ago today she has not provided me with feedback with regards to my dispute. They have debited my account a ridiculous amount. Telkom is out there milking people for their own mistakes.