Baltic Data - Deceitful employee

I went to buy a simply usb sound card, this shop is located in domina shopping mall, i asked the guy there, he located me to that device, i bought it 10 times higher price comparing with aliexpress "same chinese junk brand" but that's okay i couldn't found anything else plus i needed it so that's alright. Went home, it doesn't work. Get back the next day different employee. I explained the situation the guy looked upset and didn't want to do anything with it until i told him try it please. He tried it and i was right. He went to change it with another one, i've told him please i want a better quality or i don't need this one. He refused and said we can't do that. I said based on what laws! He tried to search for some papers to prove his point for around 15 min and failed to prove anything. He said if you want, we will take it to the maintenance first and after god only knows when, we will reply to you, that was super ridiculous. I took his junk product but all of that was not the main problem, the main problem is he actually took "the spoiled one, put it back again for people to buy it" into the normal shelf that's a complete scam. Stop scamming people. I'm not going to buy from you again. I will tell all my friends to not buy from you again. And thank you for scamming me. I don't have the invoice because it was around 3 months ago. But my latvian friend told me to write this complaint here