請教各位老師

A collection agency reported a delinquent debt (medical bill) to Experian and Transunion and my crecit score plunged by more than 100 points! I found it out when I was doing refinancing! It took me a couple of days to call around and found out that it was a total mistake. I asked them to delete the report immediately but they refused.

Today I called the agency and explained again and one agent conferenced the insurance company and the insurance agent checked and told the collectoin agent that I own nothing. After that, the collection agency faxed me a letter stating that they will contact Experian and Transunion to correct it.

Can I sue the collection agency for the damage that their mistake caused my? Or should write to them demanding compensation first?

Thanks!