I've been ripped off AGAIN............. >

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DON'T USE THIS WEB SITE ---- DIGITAL SOUND DIRECT. The web site is very good and looks genuine. Lots of very good deals, mainly sat nav and car audio, at keen prices.
I placed an order with this bunch of comedians 7 weeks ago(27th June) and have not received a bean yet. My order was for a car audio amplifier that was supposedly in stock all ?165 worth, ?230 on other sites. Their phone line is dead , they don't respond to E-Mails and they took money last week for an item I have not received.
I have contacted my card issuer and they are sending me a dispute form.
How do these companies manage to get away with it???