Sold incorrect car parts

I am highly disappointed with the service I received at Beras motor spares, I went in needing assistance with purchasing car parts for a cluth set and I had samples but I was sold the incorrect items..I have been going there every weekend since end of December trying to fix the problem and I have lost a lot of money in the process because I am being sent from pillar to post..now I'm sitting with an incorect car part and unnecessary costs due to double labour charge from the mechanic and having to bought two items I did not need to be sold.