Upgraded contract device never received

I upgraded my contract through MTN direct with the help of Angelique at the call centre on the 2nd of August 2017 and have been paying the higher contract price since August. It is now 3 months down the line but I have still not received my device. Last week I finally got some feedback because I insisted to hold on the line from 14h30 to 16h45 until somebody gives me feedback since not one single person has phoned me back in the last 3 months of numerous enquiries and messages left for people responsible to solve my problem. It was finally confirmed by DSV to MTN that the device they sent to me through DSV was not delivered to me but returned to the warehouse on the 5th of Aug. The courier DSV, has to now give MTN an R.M.A. number before MTN can dispatch a new device to me but its nearly 2 weeks down the line and DSV is not responding to MTN's demand. This is very frustrating and has been going on for more than 3 months, all of this while I am unhappily paying the higher contract. My promotional 30GIG data, 10GIG for 3 months, expires tomorrow. What a disappointment. How is any of this acceptable to MTN or DSV? What happened to receiving what you pay for???