SIM card out of service for 3months now

I am being charged more than what has been advertised. For 3 months now I have been calling there customer service and it just rings and then says the number is out of service etc. My SIM card is out of service for the past 3onths and when I email them I get no response but the have no problem sending me an invoice and debiting me. I have been paying for a stupid service I'm not getting for three months now. I have a SIM card directly from Telkom with 5oogb night which works perfectly fine which means that home cloud has somehow cancelled my service but is still charging me. I don't have money to waste like this.