Final answer:
It is false to refuse a customer's request to speak to a supervisor or to hang up on them in a customer service setting; professionalism and courtesy are expected, with exceptions in extreme cases.
Step-by-step explanation:
It is generally false that it is acceptable to refuse a customer's request to speak to a supervisor or to hang up on a customer. In customer service, it is important to provide professional and courteous assistance and elevate concerns to a supervisor when requested. Exceptions could exist in extreme situations where a customer is abusive or threatening, in which case there should be clear guidelines on how to handle such situations.