I, buyer Apple watch returned it; seller unlocked it; now technical fault can I get refund scratched

I bought an Apple watch, but had to return it for seller to unlocked it from their account . 

Seller unlocked it, than returned it. This was in August 2020, it was fine. 

I have scratched the screen, so its now not perfect.

However, now a technical issue, the screen now blacks-out constantly; Apple can't do anything, can I return it for a refund?

Doubt seller could sell with technical fault and now damaged screen.

What are my legal rights please as a buyer?

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Hi

 

Have you spoken to Apple about the issues and what have they said?

 

Is the damage you accidentally did causing the screen to black out

 

This is an awkward situation ..... have you had another word with the seller ?