When did you give them the PP transaction #?  If you did that in the past few days, it was weekend; if they are a business, they do not work on weekend.

That's totally irrelevant. Transactions with Paypal, including refunds or part thereof, can all be actioned 24/7. If for some reason you wish to physically speak with a Paypal rep, then you need to call during their business hours, which are 0600-2200 from Monday to Saturday inclusive.