poor service

the poor service i have received is shocking, i have so much money on data and airtime more than what im contracted for its not right or fair, i borrow alomost 3 times a week, when i purchase R20 airtime it doesnt even last an hour, when i contack help desk the service is even worse im told that i need to switch of backround data and roaming data which i have no bothers to go in futher to check whether there are subscriptions or something else, im spending a lot of money, rather have contract cancelled and join another contract with another company, that serves!!