what i know for sure is: u cannot transfer from business visa to work visa. only from visit visa its possible. i had such experience. in ur case if u had a business visa u should leave Qatar and come back with new visa and stamp about arrival. if u didn't do this - i afraid - u didn't get any work visa and ur business visa can be expired..if u have ur embassy in Doha - go there as soon as possible. as i know penalty for each day of expired visa is 500QR. good luck.