Lien on Title, Seller Refuses To Clear

[Mon Kaaaaaa]

Hello all! I recently had an offer accepted on a home in PA. All was going well until the Title Search showed a lien from a credit card company. The seller stated that he would sell the property by a certain date because the credit card company would accept less money as a settlement if the deal closed by this date. This required me to close the deal in 17 days from the offer. Keep in mind my sales agreement gives me much more time. The artificial 'due date' was put forth by the CC company. It now seems we are going to miss that date by 2 days, and the seller now states that he will not clear the title and refuses to sell. I still have 20 days before my sales agreement's closing date. Do I have any options to force the seller to take action on the lien?? BTW, the early closing date is not in the contract and was only put forth as a favor to the seller if the mortgage could be done in time.