Fuming but I need advice !!!!

Sh

I’m very mad as I mwritjng this so I’m probably gonna have a lot of spelling errors but it’s okay so today I bought an expensive eye mask at shoppers drug mart (not a lot of you may know what that is but if you do great) and anyway when I got home I noticed that it wasn’t In the bag and I got so mad !!! I spent slot of money on that and there was no holes in the bag and i didn’t drop it or have it hanging in a way it could fall out so I’m assuming the lady didn’t put it in the bag when I was checking out or something cause I was too busy signing up for a points card to notice but anyway. I still have the receipt that shows that I purchased it, could I go back tomorrow and say something about it would they give me a refund or give me the mask??? Especially if the same cashier that rang me in is working she would remember me is it possible they’d give it back to have something done?? I don’t know why I’m so mad about this but I am but please drop your opinions below !’