Ask them For help no body came back to me!!!

i don't have any signal I talk to mtn coverage they sent people but thy don't come back toe me the signal is poor. And i have a Friend in potch she lives on campus so is new on mtn and so cannot even get an sms from someone there is just no signal i pay alit of money every month for nothing if this problem is not correct soon i will leaf mtn and will not pay anything more