Bad service on new contracts

I app**** and received a new contract with MTN 2weeks ago as I needed a proper fne for business. With the package came 20gig data, up until today I have not received the 20gig. Firstly I was sent from one store to another just to transfer data from a Huawei to an iPhone where I ended up having to try and do it myself due to every store I went to they could not assist me as either the sales consultant didn't know how to or the technician was off. So after a huge struggle I managed to get it done myself. I have been calling MTN on numerous occasions regarding the data, 1st I was told I would receive it within 72hrs, nothing happened, called again and was told 3-5 working days, that past and still nothing. I contacted them again last night and was told I would receive it today and to my surprise Absolutely still Nothing. I actually regret changing from cell c to MTN. This is absolutely a pathetic level of service for such a huge company.