How to dispute charges to a collection agency?

How to dispute charges to a collection agency?

1. Call the collection agency and ask for the proof that the debt which they have claim is actually belongs to you.
2. Be sure that the mail which you are sending should be certified or registered mail so that you can get a return receipt.
3. If collection agency does not providing you a proof then write letter to the credit bureaus
4. You can also file to civil lawsuit against the collection agency.