I live in California. I bought a house recently and discovered right after closing that rats were/are living in the house and garage. The day of closing I found a baited rat trap on the back porch and a large pile of rat excrement swept up into a pile in the garage. The next day I found a dead rat on the side of the house. I called a pest control company the next day. I took pictures of all of it. None of this was disclosed by the seller. He claims he didn't know about the rats. I want to recover the cost of the pest control service from him. I have spoken to the RE agent. She represented both of us in the sale. RE agreement requires arbitration but I don't know how to get that going. What do I do next ? Thanks.