Unkept upgrade promise

On 19 Nov 2017, we completed an upgrade with MTN in Cavendish Square, & as part of the deal, we are to receive 30GB of data over a 3 month period(10GB X 3 months). The deals advertised is that you get 30GB of data over the first 3 months when upgrading to a LTE device. We never received this data, & in December 2017, I called the call centre(808) to query this & I am told that they cannot assist me & that I need to go to the store to get it sorted out. Not very happy that I have take time out of my schedule to go to an MTN store & probably spend the better part of an hour waiting in a queue, I go to the MTN store, query it with the consultant & get told that within 48 hours it will be resolved......fast-forward to today, & after I have called MTN's call centre on numerous occations & have been to the store maybe 2 more times only to get the same run around & same story(48 hours till resolution), with the same outcome(no data). I have even emailed the contract as requested by the last call centre consultant that I spoke to, but no response from MTN's side ever....I have to do all the running around, following up, admin, etc. The service is absolutely shocking. If the deal I signed up for was not part of that special(30GB over 3 months), then tell me, instead I get told to do "this", then told to do "that", then .....you guessed it, more of "this" & more of "that". Absolutely no after-sales service or support from MTN. I would love to see if I get a response from this.