Retina Software ePhoneTracker (purchased item)RegNow (payment made to)Zendesk (customer service location?) Refused to issue a refund for a product I can't use Internet

I needed monitoring software for my 12-year-old's cell phone.  I looked everywhere and couldn't find any for a windows phone.  When I found ephonetracker, and the website said they were compatible with a windows phone, I was so happy, I bought it right away. 

I tried to install it immediately after I got the email with the activation codes.  I wouldn't work.  Right away I contacted customer service and found out that it doesn't work on phones past windows 6. Our phone is windows 8.  I didn't even realize there would be an issue since there are so few versions of windows phones out there.  I assumed their product would handle current phone versions on the market.

I told them I had made a mistake and asked for a refund.  They refused, telling me that even though on the header of the website it says compatible with windows phones, if I had clicked on the "device requirement" button, I would have seen that the product wouldn't have worked with my phone.  Then, they say, it's their policy not to issue refunds at all.

I wrote them back explaining, again, I had made a mistake.  Bottom line is, I purchased a product I can't use.  Would they please refund my money since, obviously, I would be unable to use the product.  They wrote back that they would refund for a VALID reason, but since my reason wasn't valid, they wouldn't help me.

So, here I am, stuck with a product I can't use at all.  And, even though I immediately tried to "return" it, I'm told just because I didn't click on the right button on the website, I'm not allowed a refund.