I closed on a property I purchased a couple of months ago. I received a letter from my solicitor saying that they acknowledged that the sale was now closed and payment received in full etc. Then about a month ago I received another letter from them saying that they forgot to charge me for the land registry costs and now want me to fork out another €600+. Since this is a mistake on their part and I have emails from them confirming the amount I owed to them prior to payment would I have a case for not paying them?