3rd party claim

I have been trying since February to get any joy without success. 1st they provide me a claim number and I submit my claim.. After a month someone calls me and says that they wont be paying the claim as I privised them with wrong info.. apparently I was driving a different vehicle.. after back and forth it turns out that their client had 2 incidents on the same day with 2 of his vehicles.. they then told me that they would get the correct claim number so that I could put the claim in again.. I heard nothing from them and when I asked again.. they then told me that I should contact their client now...