Charged but never delivered

Itec promsied me a VoIP solution. Charged massive set up fees and then provided a product that could not deliver. The lines is poor quality, none of my clients could hear me, I lost so much business and have been calling them almost every day for 3 weeks. Now it seema they sold me a product that can not be used on a mobile device, and refuse to give me my money back! This after all this hassle, and me trying to find a solution. Whatever you do, dont work with Itec, they offer zero client support, make promises on which they can not deliver and in the end will be a liability to your business.