**** service and wrong package

I made an upgrade telephonically with Mtn on ***,on the 6 Jan ,I spoke to a guy called Samuel,he made the upgrade I took the my choice 2gig on this month's catalogue which comes with 5gig anytime data and 5gig night stated on the catalogue. He did the upgrade 2 days later I received the hand set,Samsung tab A8,WHEN I WAS suppose to get data I got data which was for the previous package I was on before the upgrade I called mtn on Monday to enquire and rectify this i got no help i was sent from one person to another given different numbers to call the last person I spoke to promised me that Samuel will call me and rectify the problem jm still waiting for that call,I mean I spoke to Siphesihle,Busile,Thembi,Ntombizethu,Ndumiso Zikalala who is said to be a team leader,Zama and Lebogang just to mension the few,each time I make an upgrade I get issues, customer service is poor yet we pay for these services ,I need this rectified they even refusing to send me my contract with the how silly is that...I'm so ****ed of with mtn I'm not going to pay until this is fixed