The legal question here is whether the drapes and blinds are "fixtures," which as a legal term means items that have been attached to the land or a building in a way that they cannot be removed without damaging what is left behind.  Damage, here, means more than simply the fact that the items have to be replaced; if large holes were left in the walls or windowsills, in this case, you might have an argument.  Otherwise, the window treatments were never "part of the house," whatever you might have thought, unless the contract specifically includes them in the sale.Even if you have a good argument on the "fixtures" question, you may have trouble enforcing this because you have closed title, which for issues that are not hidden or concealed usually means you have accepted the house as it was at the time.I always recommend, very strongly, a final walk-through by the buyers, on the day of closing (beforehand!) or very late in the previous day, to confirm that there are no problems of this sort.  If there are, they need to be dealt with at the closing, before you lose all your leverage by handing over the money.