now very difficult to cancel uae visa. may be uae company report to police absconding(its depending upon company status).please contact your uae pro .as far i now ,if any one left country with out cancel residence visa, they must visit any indian minister of foreign affair or embassy to get a letter(ex:due to family reason i left country,and now need to cancel my visa).they will issue a letter and that letter u need to send to your old company.