Refuse to change products they incorrectly gave me

I bought brakes and disc's on Saturday the 17 at the Springs branch and I specifically told the consultant my make, model and year of the car, but I was given wrong discs. Usually when I go to the branch, they oftenly ask for VIN number or there is a paper I give them from VW where I normally do my service that shows the model of the parts. Well this time around that I was never asked for any of that. Me trusting the consultant, I did see any wrong in that. I mean I have been buying parts from GW for half a decade, never had any issues.

It was when we fitted the discs where I realized that I was given the wrong discs as they binded the car, the car couldn't almost move. We then took them out and compared them to the old ones and saw that, the discs were wrong.

I then called in to the branch on Monday, and they said I can bring them back. Only for them to tell me that they won't take them as they are deemed damaged.

So basically I am being blamed for them giving me a wrong product. Also, should I now go and get a second opinion for verification after buying products from the dealer since it seems like we are not to trust the consultants?

All I'm asking is for the discs to be changed or my money refunded because honestly, this is not my fault.