What time does costumer service closed? I've tried looking everywhere for the answer but I can't find it*

They are correct

Either 8 or 10 pm, I think

I think the customer service desk closes at 8PM

It depends on the service you're looking for. The desk itself is normally open store hours if store closes at night. For 24/7 they tend to be early morning 7/8am to 10/11p. I hope this was helpful and you get the service you are seeking for.