To whom do I send a letter when their ADSB weather signal disappers for over an hour - or more?
Although I suppose your question was rhetorical, two avenues I might suggest:
File a NASA report. Had you not been texting, you could have flown right into the weather, so it's very much safety related.
If you still have the letter from the FAA over your egregious offence, there's probably one or two contact numbers there. You could drop them a line.