I purchased the services of an invention firm who said they would build a working protype for me. After two years of dealing with them and giving them lot's of money they sent a prototype that does not work and they cannot produce any drawings for the invention. I have written several times to refund my money and have asked for them to respond by letter or email. They keep calling me. Just today I left a message saying I would only like to communicate via email or letter and they called me saying I needed to set up a time to talk with the President of the company.
Should I call them back or should I stick to my guns?