NOT GETTING WHAT I AM PAYING FOR!

I upgraded my phone on the 18 August 2017 and my phone was then topped up 10 gig 200 minutes and 200 sms my 500mb was not loaded. the 14th of every month i get topped up , on the 14th of September 2017 i was topped up but no 500mb was loaded, and i had 200mb left that was due to expire in 2 days. i called the call center on the 26th September 2017 and reported the matter i was given a ref no:1- ********** 0866 on the 27th september 2017 at 12:33pm received a message stating the query was resolved and yet my data was not in my phone, called again on the 01 October 2017 ref no: 1- ********** 3065, received a message on the 06 October 2017 16: 20 pm that the query was resolved but still my data was not on my account, the worse part about this is the 2 ladies that assisted me with this were able to see that my data was not loaded as agreed. On the 10 October went to MTN store regarding this matter and they called the call center and i was told to request for itemized billing, Mtn is really not giving its customers value for money i mean if i pay for a service i expect proper service. you cannot tell me a normal person using data for whats app and Facebook can consume 10gig and finish it in a week. Mtn should really tell me what is happening