wrong device booked in after struggling with booki

I handed in my tablet at vodacom4u at eastrand mall galleria on the 6th of November to a consultant named Kelvin but the tablet only got booked in two weeks later after I filed a report here. I then checked the repair status only to find the wrong device has been booked in. my tablet has now been with Vodacom for over a month meaning I am paying for a service I cannot use. I am extremely frustrated and disappointed with the Vodacom service. kelvin has to account as to where he took my tablet because I am now suspecting foul play. this is totally unacceptable I need answers.