I just closed on my new home and the seller had agreed to pay closing cost and signed the contract to do so. After closing he realized that he was $6,00.00 short and he did not understand why. It is not my fault that he did not read or understand what he was signing and it was very clear to me what I had signed. I got to my new home putting painters tape up and was starting to paint when the title company called me and said that I could not move into my new home because the seller did not know what he had agreed to. Do they have the right to say I can not move into my house?

Time to tell the title company that you have a contract and if they wish to not follow the legal contract they will have to speak to your attorney,
So call the attorney you used on the real estate contract and have them ready to send letters to tittle company and seller.
You have legally closed, at closing you should have gotten the deed to file? So file it and go on with life, let the seller sue you if they want to.

Whatever the seller agreed to pay on paper is what counts. The title company messed up - not you. Do as Chuck said if you have the deed and get it recorded. Just because the seller feigns he does not know what he signed won't hold up in court should you decide to sue him. The transaction went down with him and you there. If he had any problems with just who was going to pay the closing costs he should have piped up then. After the fact is not your problem as you closed in good faith.