cheals weeping cherry online

It could be vine weevil, or it could be a fungal disease called shothole, if the latter it can be treated by mulching, and watering copiously in spring, young trees respond to a foliar feed, {not now}, if it occurs again next year, spray at the first sign with a copper fungicide at half strength every 14-21 days and a full strength one just before leaf fall.
As it,s a new plant, if it is either, I would get in touch with the supplier and ask for a refund.

Shothole is a lot of little holes as if they had been made with a very small punch. Vine weevil takes large irregularly shapes pieces out of the side of the leaves, so yours sounds more like the former than the dreaded weevil.