LAMBDA Probe Sensor

I bought the part yesterday which was already opened on the box and I accepted the part. Today when I was returning the part I was told it was fitted in the car before. However, when I received the part opened I didn't inspect it if it was fitted before so I had to take the fall for it. I think they took advantage of me and my kindness. NEVER EVER TAKE THE PART THAT IT'S OPEN FROM GOLFWAGEN MENLYN. The guy who assisted me was nice KOBUS but his manager is not. Now are stack with the part THAT can't Use. MY R1600. 00 IT'S GONE.