Infringement of Rights. Can someone read my case plz. What can be done or I should be fine?!

Well, I am a poor college student and about a month ago I created a website selling some items. Since the website was new it did not show up in Google search or anything. My products were shipped to my customers from another company (they were doing drop shipping for me, I send them customers name and address and I pay them and they send the item to my customer) Well, I didn¿t know, I copied a couple of pictures from a website. A couple of weeks ago they sent me a letter to my email from their lawyers claiming $150k for lost since I used a couple of their images. They DO NOT have my name, address or anything. They sent the letter to my EMAIL with no person name. I immediately not even deleted their images but even deleted my whole website and my domain. So no longer such as site exits. I immediately not even deleted their images but even deleted my whole website and my domain. So no longer such as site exits. I didn¿t know and just a poor student. Not a big company or anything. Can they