<prompt> Human: I sent him a copy of the cancelled check, which showed the correct amount. What happened?  <response>: You should have noticed that the check cleared for the incorrect amount 15 months ago. Youd have done something about it if it cleared for 2000 500 more, right?Just because his and your bank screwed up in your favor doesnt mean you are off the hook for the 500. Pay the 500 you owe.Since you sent the cancelled check, he has the evidence to show the bank their error. You should be prepared to pay.I dont think you should owe any interest or penalties since it was not your error. Make sure the landlord doesnt ding your credit report. 