I submitted several insurance claims in which the insurance company repeatedly lost my claims (and health information) and then demanded lots of follow-up information, which I promptly provided. It was a horrible hassle. They finally paid all claims and I thought the whole thing was settled. Now I got a letter that says they paid me twice for the same claim and they want me to write them a check for $1,000. With computerized claims processing, I highly doubt that they paid a claim twice. What can I do? Should I ask them to prove to me that they paid they claims twice? Thank you!