Web Marketing Guru

I Started designing with web marketing guru about a year ago, till this day they still refuse to give me a refund and that they insist on me paying more money for the website to "fill in contents" which cost me $495. They mentioned they custom design their websites but they actually use a template as the design is exactly the same as many of their other websites on their website which is misleading. Web marketing guru claim to be located in Australia but when I try and visit their office it does not exist. I am worried now as they have my credit card details. I would stay well clear away from webmarketingguru.com.au