How to deal with inherited tenants

[Laramie Hiebner]

I recently bought a duplex with inherited tenant, the phone numbers on the leases I received were fake. So I went to their door and knocked and I introduced myself and told them I was their new landlord. They both said they would pay me tommorow and I set a time to come get the rent at that time and one got arrested and the other said she would have it tommorow. How do people deal with someone that says they will have it tommorow then doesn't have it?