Product sold under false advertising

MTN Westgate sold me a contract where I would get a 2G data every month for the first 12 months of my contract at no additional cost. I then took two contracts and to date I have never received the 2G data on either contracts. I contacted the call centre who informed me that they are unable to assist and that I needed to go to the branch as I took the contracts out at the branch. I went in and they told me it will be resolved, I got two reference numbers and thought it was resolved. To my surprise they only loaded the 30G once off data which was only valid for 1 month, I then contacted the call centre again and they told me that they cannot assist. I went to the branch again where the gentleman who assisted me said that it should be resolved within 2 to 3 working days, to no avail. I then contacted the branch and spoke to a lady who confirmed that she will resolve the matter within 30 min, to no avail. I have been trying to contact the branch for a while and there is no answer. I find this very disturbing as they sold me a product on false advertising and miraculously no one is able to assist me in getting this mater resolved.