If you still receive calls from them, then I think you could track them down. If you couldn't, ask a lawyer to help. I just read an article at http://www.whycall.me/news/my-4500-payday-from-a-telemarketer/ about someone who sued a company after she got multiple calls from the company. She won the lawsuit and also receiving few thousands as compensation from the court. I think you could sue the caller, too.