Worst Experience With Buymondo and Mtn

I had got an mtn contract by buymondo. I received the device on the 11th of September only to find it was not charging. Took it to Mtn city view they said their not a service center was reffered to Musgrave they told me they're shutting down so I must take the device to Gateway or Pavallion, so I decided to go to Pavallion on the 14th they said I must follow with the repair center, I called repair center after 3 days I was told they don't deal with out of the box devices I should go to the store i will be given a new device. The store said i should contact mondo sales, mondo sales referred me back to the store each day I make calls to different mtn departments. I have complained to all the supervisors of these departments but still no joy. What makes me very angry is that i was billed for the device I haven't even used my pro rata that will expire soon mind you I was billed for that as well. I have had the worst experience with Mtn and Buymondo. Not even one person have called but I've been promised to receive each time i query.