@ChloeO: Our courier collection service usually take around 7-10 days for the device to be inspected, repaired and returned to you. If you reach out to our Help Desk via the link below, then an advisor will be on hand to make the necessary arrangements for you.
I have the same spots on my new Samsung tablet. I believe mine is caused by playing video games. It's a faulty screen issue with the S7s. Had mine repaired 3 times and will send it in one more time before the warranty expires. Each time they tell me the screen was replaced. 1-2 months later the dots are back.