Which act requires creditors to acknowledge consumer billing complaints promptly?

The Fair Credit Billing Act is the correct answer because it specifically mandates that creditors acknowledge and respond to consumer billing complaints in a timely manner. This legislation was enacted to protect consumers from unfair billing practices and provides a mechanism to dispute billing errors, ensuring that consumers are given a fair chance to resolve issues they encounter with their bills.

Under this act, if a consumer believes there is an error on their billing statement, they must notify the creditor, and the creditor is required to respond within a specific timeframe, typically within a particular number of days. This empowers consumers and promotes accountability among creditors concerning billing practices.

The other options, while significant in their respective areas of consumer protection, do not focus specifically on the acknowledgment of billing complaints. The Fair Credit Reporting Act deals with the accuracy and fairness of consumer credit reporting, the Equal Credit Opportunity Act addresses discrimination in lending, and the Fair Debt Collection Practices Act regulates how debts can be collected and protects consumers from abusive practices. None of these acts entail the same requirement for timely acknowledgment of billing disputes as the Fair Credit Billing Act does.