Sony Xperia M4: promotion 500MB x 3 months

I took out 2 MTN contracts on the 4th September 2015. Contract is Xperia M4, where you get 500MB X 3 months. Up until today I never received it on my contact with the cell no:***. I am experiencing endless problems with this MTN number. Before my 1st payment was due this line was suspended, i called MTN and was advised it was an error on their side. And i had to wait 2 days for this line to be activated. On this line I had a R0.00 limit, to my surprise this limited was unblocked by MTN, and due to this my bill was R1500 for the month of October. There is a reason why we add 0 limits is to avoid things like this. Besides this am i still waiting on my 500MBX3 months. i have called the call center several times and no one can help me. I was referred to a MTN branch to sort this out, the branch logged the query 5/10/2015 ref no REQ:***. Its a month later still no feedback. I called the sales center Monday and was advised I will be called back by the Consultant Anelise, she never called me. i called her on Wednesday and she informed ,me she received a message but does not have any feedback she is waiting on her team leader and will get back to me. its Friday and still no cal