<prompt> Human: Okay, about four months ago, I deposited a cheque for around 1,000 into my account and immediately encashed the said amount. Today, after a long period of time I just check balance in my account and noticed a favorable balance around 1,000. After tallying account statement for last six month, I realized bank had double credited the cheque I have deposited four months ago and still didnt realize their mistake. I wanted to know what should I do with this money? Tells bank about their mistake or just outright spend it. ThanksThe Bank is public sector entity working under Government in a 3rd world south asian country and have pretty outdated system to record transactions.  <response>: Call them and let them know. Dont do anything with the money. Its not supposed to be there and its not yours. 