Fine about Cancellation of visa

Dear sir.
Iam in Oman and i
have one doubt about cancellation of visa. What about the grace period of cancellation of visa. That means last date of with out fine that I'm staying in Oman After my visa visa will expire on October 12,  2016. So when will be the last date of cancelling the visa . after 12 ,October can I stay in Oman . how much will be the fine
Thank you.

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