Final answer:
When dealing with complaints of the FBI, it is important to address the situation professionally and responsibly. Ignoring the complaint may escalate the issue further. Advising the customer to contact the FBI if there is a legitimate complaint is the recommended approach.
Step-by-step explanation:
When dealing with complaints of the FBI, it is important to address the situation professionally and responsibly. The appropriate action would be to advise the customer to contact the FBI if they have a legitimate complaint regarding a potential crime or violation of federal law. Ignoring the complaint would not be recommended as it could escalate the issue further.
Offering a full refund or a discount on future purchases may be appropriate in certain cases as a customer service gesture, but it would not resolve the complaint with the FBI.