BAD SERVICE/ TURN AROUND TIME

I send my tablet to Mtn for repairs on the 26 December 2014 and to date I still did not receive it, I have been calling their call centre on ***9 to follow up, I have paid the amount that they needed to repair the devise on the 20th of Feb and since then they have been promising me that the will send it and they are not, I have just called them now and they told me that they don't know when will tis device be sent out.<br> <br> I have asked to speak to a Manager several times and they told me that they don't have a manager and promise that they will get their supervisor to call me but no one has bothered to call<br> <br> My device has been sitting with MTN for 2 months now and I really need it as I use it for business.<br> <br> Please assist