Refusal to sign quit claim deed by old roommate. Now he is letting liens get put on the house!

I purchased a house with my cousin 9 years ago on an interest only loan. About 4 years ago we switched it to a conventional 30 year fixed mortgage to actually pay down the house. He moved out about 3 years ago, and since then has let several companies file a lien on the house for failing to pay bills. He also hasn't had any financial obligation to the house. I have been putting a lot of money in to updating the house and increasing the value, and have also already paid $2000 in fees and court costs to have some of the liens removed. I am now trying to refinance the house and he refuses to communicate with me or talk about signing a quit claim deed. I want him off the house, and I am afraid that he is going to continue to have liens placed on the house. I have offered to pay the liens, and give him some money. Yet he refuses to even talk to me about the situation. What are my options?