I got into a car accident going maybe 3mph. I rear ended the other car, got out and looked at both vehicles. My vehicle was unharmed and the other persons car had a scratch on it. I gave them my phone number in case they wanted me to fix the scratch, but now they are calling saying that the whole bumper needs to be replaced. No police report was filed, and no other information was given other than my phone number. I don't want to pay for something that didn't happen. Should I just ignore their calls?