Your website mentions that it is open on Sundays without specifying that it is one Sunday per month or per two weeks.
I just made 90kilometres round trip for nothing, to bang my nose on a locked door despite your wrong schedule.
This is an obvious lack of respect for the customer especially when it is urgent.
Correct the situation out of respect and politeness

I loved your nice and modern drug store because your pharmacy sells lots of products including vitamins, everyday health and beauty supplies, the prices is affordable, your personnel is very nice and friendly and this place has deliveries to home and a photo service.