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A company cannot give you a work permit. You apply for this. The company can only apply for an LMIA, which takes 4-6 months as they have to advertise the job first. A bit more information would be required, like the offer letter you received (taking out personal information) and the name of the Company.
 
can a company give 5 years work permit under close work permit? is this genuine or fraud?
Please post a copy of any offer letter you have received in this thread. We can assess the details in context.
The fact that you even asking about it is a good indication that such an offer is a fake.