I still have not received an order since last month

I app**** for a device in November and was approved and informed i will receive the device within 5 working as it was already dispatched. The courier company gave me the run around and the call center with a lot of excuse, i was eventually informed yesterday that the device was sent back to MTN because they could not get hold of me. I contacted MTN your agents keep sending me back to your courier who still insist they no longer have the device in their dispatch, no one seems to know where the device is or even if i will ever get it. This has been the worst online purchase i had to get through just to get my device