Uae visa rejected so many times, plz help me?

this is first time i am trying to go to uae,one company gave me offered letter, but my visa rejected more than 5times due to my passport number is already blaklisted, what can i do to get my visa??? plz help...
Update: my company submittd evry details,they r telling passport number is blklisted,i didnt went to their till nw, this is the first time
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