poor service and a total lack of interest

I have contacted ADT more than a month ago ,requesting them to cancel my contract due to soaring tariff increases. By phone and e mail. A LAME EXCUSE WAS OFFERED OF A BETTER OFFER WHICH I DECLINED. Up until now nothing has happened. Yet they deducted a new premium today of over R600. THE SERVICE FROM CLIENT SERCICE IS TO SAY THE LEAST "PATHETIC" Please help as from their side only ignorance and silence. My cell ***