I bought a board game from amazon recently and it was really poor quality and it was only when I checked on the manufacturers website that I realised it was fak

I bought a board game from amazon recently and it was really poor quality and it was only when I checked on the manufacturers website that I realised it was fake. When I went to report it, the seller had been removed and the item was no longer available. I contacted support and of course they refunded me the money without any issue. My problem is that they knew they had shipped me a fake product, why didn't they contact me to to tell me it was fake and either send me a real copy or offer me a refund?