POOR SERVICE FROM MTN CALL CENTRE

i upgraded my contract with MTN with 2 tablets on the 8th march at clear water mall and as per the brochure as well as the sales consultant i was told i was getting "free" data due to my upgrade. i received the normal data that comes with the contract within 48 hours however no "free" data was received. i contacted the call centre on the 15th March 2019 and was told that they have logged a remedy which should be resolved in 48hours. 48 hours came and went and i contacted the call centre again within 5 days and was told that the matter was escalated. i still didnt receive any "free" data so i e mailed the complaints department of MTN on the 10th april and i was told that the matter was being dealt. i have been back and forth with MTN ever since and i keep getting the same pathetic answers and no service or turn around time on this simple query.. they are on point to debit my account every month but with regards to giving back to the client their service is pathetic. i have a loooooooong e mail thread that shows how *********** and how useless MTN is at resolving something that is a small issue..i really am at the point where i am fed up and need service, customer satisfaction should be number 1. i am not asking for anything more then what was promised to me... another issue i have is that when i do load my OWN data on my tablets the network is so slow and i am unable to even browse the net however the data gets finished. this makes no sense.. hopefully i can get some straight answers from MTN....