Therefore, 500 pts is the equivalent of knocking $50 off the bill
heh, then I'd have asked they just knock the 50 off. In reality, the points are worth more like 5 bucks.
You can always follow up with Salt Lake, if you got names. Marriott's standard of service is the cornerstone of their business and perhaps they can help the hotel handle such situations better in the future. IMO, they should have merely asked what they could do to make things right by you. Excuses or burdening the customer are not proper responses.
A mitigating factor would surely have been not reporting the problem contemporaneously, as most full service hotels have engineering staff on duty 24/7. Even if the electrician had only unplugged the unit and left, you likely would've had a much more pleasant ending to your stay.
Perhaps there is a lesson here for all involved.
Pat