How can I get this investment back?

My father invested in a new company a few years ago. He fell ill and things changed financially for him. He's asked to sell his shares, but is getting the run around. As his power of attorney, he wants me to take care of it, but I'm getting the run around also. The person to speak to is hardly ever in the office and doesn't return calls. They keep saying they "don't have a system in place to return funds yet." Today, I told them "that's what you said last year," and at that time I asked when they'd be ready and they said "July." I don't want to face the embarrassment of having been scammed. Dear Goodness! I know I should call a lawyer, but honestly don't want to have to pay someone a big chunk of money for something that should be so simple. What should I do?