How to get buyer/tenants out of my home after short sale was declined. Their tenancy was based on their purchase And now will not leave/pay?

Accepted buyers offer to buy home. Parties agreed to buyers' tenancy as initially appeared short sale would occur and they sold their home. But bank declined sale. Seller agreed to list and try sale again at higher price. Buyers angry, refuse to go to higher price. They remain in my property, will not pay weekly rent, will not allow us to show home. States owner can not enter home. i gave them notice to vacate property by 11/30/2016. What are my rights to show my home? Can they dictate my entry into my house when I give them 24 hr notice, even if they are not at home? Tenancy agreement was based on the potential purchase. After deal failed, offered new agreement but tenants refused to sign and said they will leave when they are ready to go. They owe me about $5,000.00 past due rent.