Loreal — Loreal duplicate product was sell to me

Recently I purchased loreal shampoo and conditioner from a salon worker which to surprise found that it was duplicate and I'm sure he must have sold duplicate product to other as well. But on confronting him he denied it completely saying it is not his mistake shopkeeper sold him duplicate products. I can't believe him as he is in this business from quite a long time he must have been aware about duplicate and original loreal products.