Tenant is not vacating the floor

We have a registered agreement with out tenant. We requested them to vacate the floor but in vain. The agreement will expire on 5th May, 2019. We have issued the notice to them on 26th April, 2019. They received it on 29th April, 2019. Our lawyer too is familiar to the tenant that\'swhy we are in dilemma. The tenant is saying that by 22nd May, 2019, they will vacate the room. But we can\'t trust them. We are still ready to give them time. Our lawyer suggested to take an undertaking from them stating that they will vacate the floor by the 22nd May and the same undertaking will be registered by the notary. We appeared in the court to do this job but our tenant refused to appear. Now, I would like to ask the following questions to you: 1. As our rent agreement is duly registered and have stamp of the sub registrar, How long will it take to vacate the floor? 2. Are there loopholes that they can use to extend the agreement? 3. What other ways we have left with?