Hello, I wonder if anyone can help. Early on this year, I worked for the NHS for just over one month before handing in my correct notice to leave for another job. Since then, I have received letters from the NHS claiming that I owe them money, for hours worked/hours paid. On looking at the figures they supplied, it transpired the opposite was in fact correct, the NHS owed me money along with some travelling expenses incurred while in training. I have contacted the NHS department in question and told them that I dispute the claim they have made, I was assured that they were looking into the matter. However this morning I received another letter from them, this time stating that they may "Exercise their statutory rights to claim interest and compensation for debt recovery costs" I have phoned them again today and spoken to the people concerned, however this time, I wish to back it up with a formal letter that tells them that this payment is under dispute, I have the money to settle the dispute if it come out in their favour. However until this is reached I would like them to stop with the letters threatening action. I have a house and mortgage and do not wish to have any form of credit action on my file. What areas of law am I covered by if they disregard the letter and continue to ask for payment which is disputed? I find it quite distressing that they can continue to send these letter threatening action towards me, when I strongly believe I am correct and they owe me money.