Extremely bad

Mtn decided to change our billing date .for what reason i dont know...they didnt even bother communicating with us ..now the account is not upto date but whose fault is it...then u go and suspend our line ..making our lives horrible ...God knows how many calls we have had trying to resolve this matter but no one seem s to know what to do they keep shifting the blame....we chose mtn cuz they were the best but now i regret ever joining them.....mybe i should boycot one of ur branches to get my account restored ....can someone from management solve this issue...