*****ulent dealing by mtn network

Mtn is a *****ulent network. They force people to take contracts and don't fulfill there end of the contract. I took a contract out with mtn which was for 3 years. From the first day I took out this contract they have been robbing me I took out a contract for 80gigs day data and 80gigs night data for 269.00 a month. 2 years are now gone by and the only data I receive 20gigs day and 20gigs night. I have queried this for to years but it has not being rectified. This is the 3rd year going and still I get the incorrect data and I'm being charged the full price with no compensation for the past 2 years and this year there is a increase in in my tarrif as well and I still receive the incorrect data. I hope that any person be aware of mtns *****ulent dealings and if there is someone that could assist me in solving this matter I would appreciate