Thanks so much for the support everyone! i really needed that.
I really don't get why i was treated that way, i also carried a mezzo bag when i went in the store (but then again, every customer that was in the store had a lv bag with them), but they kind of looked snobbish at me and then ignored me, almost like they don't want me to carry lv or something.
I already went back to ask for the lock&key immediately the day after i purchased it, but they laughed at me and so today i'll try to get a refund and buy it elsewhere. I also called the store manager yesterday and explained in a calm way what happened. Guess what, the manager first put me on hold and then told me that the SA DID give me the lock and that if i wanted a lock i can buy it!! Honestly, i don't even think they will take it back if i go back to that LV store, just because i don't have that damn lock! I'm so angry. This was my first and last time to the Amsterdam store! I'll probably go back to london or antwerp.