Final answer:
The Referee should verify the Team Captain's claim, and if it is correct, instruct the opposing team to remove the excess team officials from the players' bench to comply with the rules.
Step-by-step explanation:
If a Team Captain advises the Referee that the opposing team has more than the allowable number of team officials on the players' bench, the Referee should take action to address the situation as per the rules of the sport being played. Initially, the Referee should verify the claim and if it is found to be correct, they should inform the team in violation of the rule and instruct them to rectify the situation promptly. This may involve asking the extra team officials to leave the players' bench to adhere to the regulation that controls the number of staff allowed in that area during a game.