MTN SERVICE REALLY BAD

I am really disappointed in MTN service. i had a contract with Nashua . When Nashua closed i was transferred to MTN. Now i have a problem with the amount that they deducted this month which is high. i wanted to ask what happened so that it can get fixed. but all i get is just a song on their line. since the 25th of March . i hold for almost 20 minutes and still nothing happens until i drop. when i call 808 every time when i press an option for agent the line just dies on me all the time. not sure what drops the call but i end up being cut off the line. i am really tired because i dont any respond but they take my money. if this is how they treat thier clients then i will rather take my contract money somewhere where i can get help. this is seriously bad and annoying.