How to vacate the tenant from a property purchased upon verbal assurance by seller?

I purchased a tenanted villa recently. Before signing form B, we asked the seller through the broker if the tenant could vacate the house upon expiry of the tenancy contract, and the seller said yes verbally.

So we signed form B, proceeded with the buying process, and confirmed as vacate house again with the seller during the final transfer.

We've sold the place we used to live in because we will move into this new house and stay in temporary accommodation until the tenancy contract of this new house expires.

However, now the tenant doesn't want to vacate the house upon expiry of the tenancy contract.

What can I do in this case?