iphone x. Some dust under camera glass.

Hello, i have a question for you. I buy my Iphone X 6 days ago. After some using my device i check a camera glass and i could see some dust under him. It was a problem for me and i can guarantee what i don't damage and don't wash my phone. So, my question is - it was a guarantee case or not? Can you please give me call back quickly as possible. Picture of camera lens where dust be i attach in this letter.