You could argue that the mirror and the wall form the enclosure as you need to remove the mirror to expose the connections
I wouldn’t be losing any sleep over it
So it’s an IP rating issue - photo?
Agree the switch needs remedial work
Issueing a report getting an item mixed up with another property is a poor excuse to say the least
How long was the spark in the property?
Maybe not use this person again
1. Have a realistic budget with 20% contingency
2. Use local trades found through recommendation who are local
3. Don’t have ambitions to complete it quickly
4. Don’t pay anyone up front