Bought Home Over A Month Ago And Sellers Still Won’t Let Us In

Need advice…. We closed on a house 11/2 and contract states we take immediate possession. Sellers asked if they could stay until 11/22. We said OK. On 11/20 they said we need one more week and will be out before 12/1. We pack our belongings and arrange movers. 11/30 comes around and she says we need another week. I tell her this is not ok - my husband took vacation days to move us and we have mall these people set up to help us. She promises we can move in by the morning of 12/6. I ask her if I can come get keys the evening of 12/5 and she says no, but this is the gate code and I’ll text you when we leave. 12/6 comes around and no text. My husband reached out at noon and asked if he can start moving things over. She said 1 more hour. At 4pm her husband texts me “Haley this is Jim Brandys husband. She would have called but she’s been crying for the last few hours. So long story short we need until tomorrow around 2-3 to get everything. Real close though!” I say what happened? He claims that one of their dogs bit her. I ask if she had to get stitches, he responds that they did not need to go to UC or ER. I reply “I’m sorry that happened and grateful she is not needing emergency care. If the plan was for you guys to be gone by this morning, I’m not sure why it’s tomorrow afternoon now. We are just frustrated that we are paying a lot of money for a house that we cannot get into (we have paid $4500 in mortgage since the date our contract states we have possession). We have extended the deadline 3 times now. We understand that moving everything to a different state is very difficult and feel we have been very patient but with no attempt to compensate us for these delays we are becoming upset” and he claims that the compensation is all the items they are leaving, all of which were included in the purchase price and contract and were in now way wagers for additional time. He also says that they have squatters rights and they can stay there as long as they want. I called the sherriff and they said they can’t do anything, it would have to be filed as a civil claim and that will take time. What can we do