New to the forum dealing with CRS

Hello I finally joined the forum after a few days of reading all the information that you have. I am dealing with CRS 877-457-4640 regarding an internet payday loan I had with JVC. They've been calling nonstop threatening me with a summons to court if I don't pay the debt. I finally talked to someone and said that I would like an address to send a debt validation letter to and I got placed on hold then an account manager came on the line and asked me what the problem was and I told him I needed a validation of the debt to prove that it is mine and that if it is paid that the debt would be taken care of I also told him that I have never received a dunning letter and their first initial contact with me was last week. He then went on to say that I will get validation that the debt is paid off after the balance is paid off as well as confirmation numbers after each payment. But I was like sir I want validation before I give you any type of payment information. Then which was odd he then said well at the CRS law firm that is not how we do things we're not going to validate anything whether by fax or mail and this is the first person I talked to that said they were a law firm. He then said are you going to set up a payment arrangement?? I said sir under FDCPA it is my right to validate this debt before any further action is taken. He then said we'll see you in court and hung up. Does anyone know of an address to send a debt validation letter to since no one at the company is willing to give me one??