Disappointing don’t have a contract with them

I have an mtn contract with these ones and from day 1, they’ve never given me the data plan I agreed to and even so they made me pay double the amount I agreed to and no one had an explanation for it. I call them 3 times a week and until today no one has gotten back to me to say they’ll fix and each time I call I have to start my entire case afresh with someone new, they don’t even respond to emails. I resorted to opening a case where they must retrieve phone call records of my agreement and it’s been 3 weeks and no one has provided feedback. Last Friday I called them for the 100th time and they promised to get back to me before 5pm and they never did. I don’t know how much airtime I’ve spent calling them, they have no customer care line but also will never call you back to fix the issue. Don’t sign a contract with them, otherwise you’ll spend the rest of your life running after them.