Invoiced for a trucks excess i don't own

I received an email from Reinell Russo of Legal track & Financial services infroming me a vehicle i own was involved in an accident. When i queried i found the vehicle was not one of mine, infact not even the CA registration all of my vehicles have. Also dont own a truck. I indicated this to her as i am being invoiced an excess on someone elses vehicle. I expected this would be the last correspondence as i am not involved. They are still pursuing me for this excess and i fear they may affect my credit rating. I would appreciate this being dealt with.