Affiliate Marketing Secrets

A year ago, I sold a car to someone who never returned my license plates. Then a few months later USAA sent me a letter saying that I was at fault for a car accident. I was scared, and realized that this woman had gotten a hold of my license plates and got in a car crash and the cops didn’t run all the info all the way through.
I had filed a report about the stolen license plates but I never got a chance to get the actual police report and they had a hard time finding it without the number they wrote on a card for me. Well I got the registration for the car the license plate belonged to and sent it to USAA to finish it out and they said they were good and that the woman who actually was in the accident wanted to accept full financial responsibility.
Recently the financial department from an insurance company that was affiliated with USAA has been coming after me since the woman hasn’t payed recently. Can they still do that?
The dept. of safety in my state sent a letter to me saying:
” We have recieved a release submitted for the crash that occurred on SEP 1, 2011.”
Can I get out of this and doesn’t the letter from the dept. of safety mean that I am no longer responsible?

I have received multiple phone calls from a fraudulant company saying that I owe them money (I have already verified that I do not, as they said they are a debt collector for Cashnetusa.com. I called the actual company just to make sure there was nothing wrong with an account I had opened up previously. They said I was in good standing and that other customers have complained about the same type of phone calls, but it is not in any way affiliated with cashnetusa.com). I have all proof, etc of this. I was told I needed to pay back $400 that I supposedly took out in July of 2009 (which again is crazy because I did not even know there was a company called cashnetusa.com at that time). Anyways, I know that some people may suggest that I stop these harrassing phone calls by either getting a new number or blocking their calls. However, not only are they calling my work, they’re calling from multiple different numbers from area codes all around the USA. In addition, they have my social security number, bank information, and other personal information. I have put an alert out on all three credit bureaus and filed a complaint on the FTC. However, I went to file a police report as well and they refused to do so. I even explained to the police woman that not only do these scammers have my information, but they’ve also threatened to come after me. In the man’s exact words, “I will personally come after you and make you pay for this money you owe.” Please remember that there is no money I owe in the first place. These people also say their names are Mary Smith or Mike Miller, yet have the strongest Indian accent when they speak. I told the police that I’m concerned because I’m not sure where they are really located and they have access to my personal information so can find me at home and that I live alone so it is something that concerns me. She told me the best thing they can do is if someone who looks suspicous shows up at my home or work then I should call the police. She didn’t even let me file a report for my stolen information! I feel like this is completely illegal. So I have to wait for these people to either come find me or use my information to steal from me. What do I need to do?