Misold MTN contract

I upgraded my MTN contract 30 June 2017 and received awful service from the MTN store in Parow Centre (lower level branch). I upgraded and added an additional line and firstly didn't receive sim cards for either one of the lines, this resulted in me traveling back and forth to the store for three consecutive days and having to pay for an upgrade Sim at the end. I refused to pay for it and cut my existing Sim card instead. I was then promised 30GB promotional data as part of the offer for the upgraded line which I still haven't received. I was so appalled by the service in store that I decided to handle the matter by calling their customer service. After calling numerous times I still haven't received the data that was offered. I also complained and made a query about having no use on the additional line due to the usage limit being 0. I spoke to a manager named Leshane on 19 June who swore both matters would be resolved in 24 hours, yet the usage limit and data issue has not been resolved. I've emailed MTN complaints on 19 June, and have a screenshot of the complaint going through successfully, but I still await a response from them. I'm disgusted and extremely disappointed in the service I have received from them this far and feel like I am now paying for a contract that was misold and phones that are basically to no use.