Query about Oman Visa Cancellation

Hello Guys, I was working in Oman, and i got a job in Qatar. I moved to Qatar on 15-June-14 without cancelling my Oman Visa. My Oman Visa was valid upto 28-August-14. I want to ask whether my Oman visa can automatically get cancelled since i did not extend it, or do i have to get it cancelled. The reason i am asking this query is that my Oman Company is asking me to get my Visa cancelled by coming to Oman, and only then they will clear my Settlement. Your help and suggestions would be highly Appreciated. Thanks.