Bought tickets online on the morning of our visit ...

Bought tickets online on the morning of our visit to find the museum closed due to covid-19 upon arrival. Which is fine, but...
1. Why are you still allowing visitors to purchase tickets on your website when you know you are closed? I checked in the afternoon and the website was still selling tickets for that day.
2. No email sent out to visitors advising closure. How hard can that be?
3. Staff standing outside of the entrance charged to explain the situation to visitors were rude and arrogant.
4. Numerous emails requesting refund and patiently waited for 5 months, still haven't heard back. Not even an email.

I can understand things are hard because of Covid-19 but after 5 months, i think this is a matter of incompetence. What a joke coming from an internationally acclaimed museum.