Incorrect device received

I recently upgraded via Mobilesplus. An incorrect device was delivered on 19 Dec. I phoned MTN who referred me to a MTN store. I spoke to a few stores. They cannot assist and referred me back to the MTN call centre. In return I was referred to Mobilesplus. If you are lucky enough to get through, nobody is even prepared to listen. I spoke to five people and every time the call was dropped by them. Mobilesplus, get this sorted.