Mtn a *****!

Last year July I took a contract of two phones, so mtn decided to debit me for one, for what I don't know. So this year March they started to debit me for two phones and I didn't have any problems with that, suddenly they start sending me emails to say I should pay them I'm in arrears?! How?? I'm being debited every month where is my money going?? Last month they charged almost a 1000 while they always debit me 609. Now they've blocked my simcard. I SMELL *****. MTN I'M VERY ****ED AT YOU. I'VE BEEN A GOOD CUSTOMER SINCE 2012 I'M VERY DISAPPOINTED