Delayed Delivery - Incorrect Part - No Response - Blue Ticked

I am unhappy with the customer treatment I received from GPO. I bought a steering rack for my Peugeot 206 from them. I provided all the details of my vehicle so that I am given the correct part. The part arrived late. On arrival, I realised that the part was incorrect for my vehicle. I consulted the sales person who assisted me to enquire about how the part can be returned. My call was taken the first time when I called to complain about the incorrect part...that was the only time I was able to get told of them. I have been deliberately ignored since them and "blue ticked". I am stuck with an incorrect part which I cannot use. I am far from Heidelberg so I cannot personally go there. I would not recommend anyone to use their services.