MTN UPGRADE

good day

so in July I was due for a upgrade ; the upgrade I have done was on a Samsung S9 R699 FOR 150 MIN AND 1GB OF Data but they had a special where you get R100 of your subscription you get a extra 1GBof data for 12month. so on the 14th I receive my monthly data and min but no extra 1gb as promised by MTN DIRECT since then I tried to sort this out ; every time MNT Direct says Granny that sold me will call me and I iam still waiting going for 2 weeks. I have tried to request a copy of my contract that they have send me and I also asked for them to send me the voice recording where I agreed to take out this contract and the told me they can not send this to me and I need to visit mtn store that is 200km from me. so I started to believe there is no voice recordings done as mnt says. I then spoke to them again and they told me its a fault on the people side that runs the special the will be sending a email to them and I should receive my data and sill nothing. the keep sending me sms that says that my query has been resolved and no one even contact me o the just sent it. I then upgrade a extra number to the note 9 that they told me I will receive a docking station as a welcome gift and if I am one of the first 500 ill receive an extra gift and thewill call me the following day to tell if I am one of them and iam still waiting ; but I did the pre order and on the web the welcome gift for pre order from Samsung is a wireless charger ex so what is mtn doing with this? iam disappointed in mtn after service. being a customer for almost 10 years and this is the way they service you?OH and when MTN Direct ddnt want to help I phone the complaint department and a lady Gwen started laughing at me ?