They blocked my number!!!!!

This company is a FRAUD and has no idea how to treat customers. I have been trying to email and call them and they wont return any. So i called today and finally got ahold of someone, i gave her my invoice number and before i could ask for a manager she told me to back off and hung up on me, when i tried to call back i found that she blocked my call. So i called with my house phone, she did the same thing, and blocked my home phone. They owe me 500 dollars and i cant get ahold of them to get my money, and they wont ship me the product i paid for!!! this is crazy, i dont know how this company is still open!!!!