Dear Mr & Mrs Scorpio
Glad to hear you had an enjoyable visit despite one strange and frightening episode.
Now that you have this off your chest is it time to let it drop?
If not you should know that contacting the Belize Tourist Board, the Tour Guide Association and Belize Tourist and Industry Association would provide more sympathetic responses.
Without having a name of the person that harrassed you, a vague description and a hunch about where he works might not be enough information to warrant an investigation.
As one of the earlier posts suggests, this fellow might have simply overheard your names and where you were staying - it might not be an employee of the dive shop that you frequented.