Xoasis.com ripoff Seattle Washington

I bought a domain through Xoasis.com and since I didn't need much in the way of hosting I chose their free hosting. I eventually paid them to remove a pop-up which they never did. It was frustrating trying to get rid of pop-up and I gave up. Recently I found a very reasonable place to host my small site with no pop-ups. I have been trying for over a month to get Xoasis.com to release my domain but they ignore my calls and emails. I used whois http://www.netsol.com/cgi-bin/whois/whois to look up company information and have tried every option I could find. Additionally their site has not been up realiably but that is consistant with their apparent operating procedures?

Jerry
Seattle, Washington