employment visa in uae

sir,i have been selected in jindal saw gulf in abudhabi uae.for joining there they have applied employment visa in uae. but my visa request is cancelled and reason told me by the athorties (mol) that u already have another work pirmit by another compney so your request for visa is cancelled.but i never applied in any compny except jindal so how do ihave another work permit and what should i do to cancelled that permit .please help if any one knows about this kind of situation.please help