Cancelling the Lease within a wekk

[Gracy Josh]

We found a tenant to our single family house in GA, and completed all the formalities like Lease Contract signed, Move in check list completed and signed, Keys handed over to them and all the utilities changed to their name and the Tenant also moved some of the items into the house. After one week of signing the contract they want to back out due to their another property closing issue. No terms has been mentioned in the lease agreement about cancelling within a week or month other than the regular Early Termination details. Please advice how to proceed about this issue.