Which of the following is an example of a consumer protection complaint?

An example of a consumer protection complaint is the act of reporting an increase in costs without warning. This scenario captures a situation where consumers could feel misled or exploited by a business practice that lacks transparency. In many regions, consumer protection laws mandate that businesses provide adequate notice to their customers regarding price changes. When a price increases without prior notification, it can undermine the trust that consumers place in companies and might lead to financial disadvantages for them. This aligns with the principles of consumer rights, which emphasize fair treatment, honesty, and the right to make informed decisions.

The other options do not exemplify consumer protection complaints. Complaining about high prices during sales, while a valid concern for consumers, does not specifically address a lack of transparency or fairness in the transaction process. Offering consumer education seminars and promoting new products, on the other hand, are proactive efforts aimed at supporting consumer knowledge and engagement rather than addressing grievances related to deceptive practices or unfair pricing.