<prompt> Human: Theres a collections company that has been contacting me since September claiming I owe them money because my account with a major US Shipping Service Dont wanna say the name went into collections and they bought my debt or whatever. The thing is, I have an account with the shipping service but Ive never spent a dollar on it. I called the shipping company and spoke with their billing department and they said I have never owed them money and they would have contacted me before selling my debt to a collections agency.This collections company has contacted me twice via Mail and 3-4 times via email. I looked them up and theres hundreds of reviews from people with my exact same experience - the company saying we owe them money even though we dont. Ive ignored it so far, but they seem persistent and wont stop contacting me. The amount isnt much, like 40 something. But I dont owe the money. Can I just ignore them or are they going to mess up my credit or something? Thanks!  <response>: Do not ignore this. Dispute the debt and demand validation. 