"… when Dan Cain went to the Twinsburg Post Office to find 79 bins of mail, each containing roughly 700 copies of the same letter addressed to him, he knew something was very wrong …
… Compounding the mistake, the 55,000 letters had an incorrect payment amount, according to Cain. The company used the wrong interest rate to calculate the payment, he said …
… Cain had to pick up the bins up from the back doors of the post office. It took him two trips to bring home the useless pile of letters, which he believes cost the company thousands of dollars to send, he said. If the company used a bulk rate discount of between 18 and 20 cents a letter, it would have cost up to $11,000 to mail the 55,000 statements. …
https://q13fox.com/2020/02/05/a-company-sent-an-ohio-man-55000-copies-of-the-same-letter/