How to activate eligibility number for prometric

I have applied in mumaris and i have got eligibility number 8months back. Due to some personal reasons i cant attend the exam at mean time. As i am trying to attend the prometric now its reports that eligibility number has been expiered.  Friends please help me to get a solution. Right now am in riyadh. Where should i have to go what should i have to do.  Which office. Plz help me

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