Data not loaded for 2 months

I am very disappointed at the service I got from Mtn. I upgraded my contract with them on 26November 2018 ,part of the deal was that I get 14GB every month for 12 months but I only got the data once when I received the phone, they only load the minutes and the sms's but no data. I have been calling them so many times pleading with them to please load my data but it seems like no one is willing to help me. The frustrating part is that they continue deducting their monthly premiums whereas I don't benefit from it and I have to call them every single day for just one simple thing. My ref numbers are 1_ ********** 7416 and 1- ********** 6496 &1- ********** 5375