complain

I went to the spares with the sample of the part I was looking for, which it was petrol pump for Peugeot 206. the sales man gave me the wrong one which I went home with it try it on my car but it was not working then I went to Peugeot and Diesel Innovations ask why it doesn't work. they've showed me the right one and I went back them asking them to give me the right part instead they told me that I've used it which I did open it but it didn't work and I even bought another one at Diesel Innovation and I does start. They don't even want to exchange with anything and the salesman agreed that he made a mistake, And the own told me that he doesn't want it.