In most places, black belts do not have special licences to do anything. As such, you wouldn't be able to get his licence revoked.
What you can do, however, is file a complain to your local police department. If indeed he tried to strangle you while you had not acted menacingly (some places recognize pre-emptive self defense as valid if the threat was severe), this qualifies for assault under most laws and you, in fact, should report such behavior to the authorities.
Undergoing strangulation is good grounds for claiming self defense, especially if your opponent, as you claim, knew exactly what he was doing. If you chose to report the assault to the proper authorities, I would strongly advise you to be passively cooperative, and let the investigators to their job without interference. Self defense claims are not always so easy to judge if there is no evidence or witnesses, and police officers are often wary of these cases; being pushy about the investigation will not help you at all.