<prompt> Human: My employer sent me a letter in 2015 stating that theyve overpaid me eight thousand dollars over the course of two years, a slight overpayment on each paycheck. I honestly never noticed, it was my first ever job so I was just happy to be getting paid. I ended up quitting in 2015 because of school. Since 2015 to 2016 me and my employer had a few letters sent back and forth to each other. Though they always ignored whatever I said and just sent the same response back every time more or less. I was the last person to send them a letter, they never responded to my last letter which I sent in 2016. I thought maybe they agreed to my terms of settlement for something that was never my fault. Now at the end of 2017 I got a letter from a collections agency saying that I owe that money. I thought me and my employer were still in dispute over the issue, they just ignored my last letter and sent me straight to collections. What are my options now?  <response>: FYI I am Canadian in Ontario and was also overpaid by an employer... Heres something I learned at the time that may help you:quoted from a discussion with my lawyerGenerally speaking, when an administrative error is the cause of the overpayment, she would need to pay the money back unless:1 The overpayment was an error by the employer;2 It was reasonable for Virri to not realize she had been overpaid;3 Virri relied on the overpayment to her detriment.If all three of those were true, then she may have an argument that she need not pay the funds back.You might want to lawyer up and at least have a conversation with yours about this - in my case, I could prove all 3 of the above applied to me and I ended up settling outside of court regardless. This information may also be outdated now, though. 