Don't ask for a refund, go to your bank or CC company and charge back the 6 months. That'll hit them where it hurts. Little known fact about chargebacks: the merchant pays an administration fee, typically $20 to $50. Per charge! That is why the smarter scammers refund to everybody who complains, not refunding is plain dumb. This scam has been around for a long time, usually it's adult companies that sell you a 'free'…
I'm kind of surprised no one has started a service for merchants to warn them of chargeback prone customers (there are people who go straight for the chargeback without even trying for a refund first).