Mtn worst service provider

My experience with Mtn has been nothing but a nightmare, from the time I took their month-to-month contract. I've been trying to get it canceled since May. I did everything they told me to do to get it canceled. Finally on the 4th of July I get text that it will be canceled on that date. To my surprise, I get an invoice from Mtn for August and when I call your call center I spoke to 5 different people who did not know what they were doing I've been passed around from one department to another and my contract is still not canceled.