Ripping the poor off

Im soo tired of being ********** by mtn ,I hate mtn soo much, i have used it for for over 15 years but the way it rips people off makes me wonder why im still using it, today i bought 2 data packages (daily and weekly and now i notice that it has been subtracting from weekly instead of daily as it's supposed to, im very ****ed off because the daily one wont be availabe come tomorrow, but that's what they do even airtime just dissappers, they need to be investigated