www.mfaic.gov.hk/evisa accepts payments but does NOT provide Visa = Scam ?
Having visited recently I'd recommend to get visa on arrival.
Did you check the status of your application at 'Check and Change' on the site? Did you look in your 'spam' folder? Have you contacted them?
I would try the above before you contact your bank to dispute the payment.
I got and used successfully my e-visa from http://www.mfaic.gov.kh/evisa/ less than 7 days ago. They are not a scam site, but not worth the extra cost, either. The best visa solution really is the visa on arrival for $20 + passport photo, as recommended by forum regulars.
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