Final answer:
Customers are likely to complain if there's a violation of the existence assertion for cash receipts, indicating that recorded cash transactions might not exist or have occurred as reported.
Step-by-step explanation:
Customers are more likely to complain to the entity if the assertion of the existence of cash receipts is violated. The existence assertion ensures that cash receipts recorded in the financial statements exist and that transactions have occurred. When there is a discrepancy between the recorded transactions and the actual cash that customers have paid, customers may notice the error, flag the discrepancy, and complain to the company. This could arise due to a mismatch in the amounts, signs of tampering with receipts, or other irregularities. Such complaints are a signal of the need for better internal controls and accurate record-keeping to maintain customer trust and ensure financial accuracy.