tablethasnt beenbookedfor3 weeks

Hi! I went to vodacon on the 6th of november to book in my tablet and I was assisted by a guy named Kelvin. I did not have the IMEI with me,so he suggested I leave the tablet and call back with the number which is what I did.the tablet sat in the vodacom store for about 2 weeks and he ddnt bother to inform me that he didn't receive the number.I called him again last week and gave him the IMEI number but to my suprise when I call the repairs centre my tablet is still not booked in,I called thestore manager but my ImEI number cannot be picked up.How on earth is that possible?I need answers I paid my account its up to date and this is the kind of service I get from Vodacom its been too long 3 weeks what happend to my tablet