Delta Sound poor service

Hi Recently bought music item from their online store company called Delta sound (apparently based in Rustenburg). Their online website is Deltasound.co.za and everything appears legitimate. I've done purchase by paying the item in full + delivery fee with an additional insurance fee that was required, I was promised delivery last week but it's now a week after the promised delivery and to date received anything. With multiple attempts calling the company and sending emails, I don't receive any response or calls being answered.