<prompt> Human: For about a year now, on my monthly electric bill, a credit keeps showing up for what seems to be random amounts. The bill is usually around 40-50month, and somehow each month an 80 ish credit is applied to my account. Online, it says it was paid via online banking and my bank account is linked, yet the money is NOT being taken out of my bank account.This is great as I have not had to actually pay my bill for a year now, but I am nervous about what happens ifwhen they catch the mistake. If that happens, would I be responsible for paying the past bills, even though it was their mistake? And it seems as if they are getting paid from SOMEWHERE, so would they still make me pay? Has anything like this happened to anyone? Not sure what to do.. additional info: i am renting in a small apt complex, this is not for a home i own. i dont plan on moving out anytime soon, so moving and ending the contract isnt an option. i live in a major US city so this is not a small town electric company, this is a massive one with millions of clients.  <response>: Call them and ask what the credits are. Be prepared to pay them everything you should have been paying. 