<prompt> Human: Original thread:Wow, I have to thank everyone here who gave me advice , because it worked! I went from being hounded by debt collectors for 4,000 and ignored by my former apartment office two weeks ago to receiving a check in the mail today for more than 600, an official account statement declaring I owe nothing to the apartment office, and a letter from the debt collection agency stating that, at this time, they were unable to validate my debt!I honestly have no idea why I received this 600 refund, as the apartment office never previously stated while I was moving out that I should expect it. Either I just have a bad memory or it was a result of my interactions with them after finding out they sent me to collections without reason or notification.I am so grateful I came to this sub for advice rather than losing my head and just shelling out cash to get it off my mind. To anyone who feels they are being asked to pay a debt in error, the advice given in this subreddit, particularly in the FAQ entry on collections, really does work; no matter how rude and insistent the debt collectors are, the system really does protect those in the right.  <response>: The 600 might either be a refund of any security deposit you had left over that they took or a refund of your rent.Most places wont allow for double charging of rent. That means if they rent out an apartment you leave early they cant charge you for the time that they received rent from the other party.For example you paid all of June and moved out the 10th.They rent it out the 20th and receive rent from the new tenant.You should get refunded remaining days. 