wrong package and bad service

On the 25th of Nov 2017 I have app**** for a data promotion contract of 30G data per month for R199 on the black Friday special. I had to wait for an approval till the 28th of Des 2017. Every time I did enquiry about the contract at Mtn River walk Vereeniging they were "off line" and making excuses that head office kicked the application out it was loaded wrong and they will resubmit the application. When I got the approval eventually the contract showed 5G any time and 10G night time and its suppose to be 20G any time and 10G night time. When I enquired about it the sales lady told me that is because it was the promotion and I will receive my full data of 30G and I just have to sigh the contract. On the 14 of Jan 2018 I have received my monthly data and only received 5G any time and 10G night time. I went back to River walk shop and they were "off line" again and the sales lady told me to phone 808. I phoned 808 on the 16 Jan 2018 13h15 the consultant told me I must go back to the shop where I have app****. I told her that they were "off line" again and not very help full. The consultant then told me they will investigate why I did not receive my full data of 30G and that it will take 48 hours she gave me a ref nr ********** 90 after 48 hours and no word from mtn I phoned again on the 18 of Jan 2018. The consultant then told me it will take 72 hours. This is now a week later and still no answer from mtn. I would like to receive now the correct data of 30G that I have app**** for and I would like this matter to be resolved as soon as possible.