Don't buy from iStockPhoto!
I didn't purchase anything from their site after 2015, but recently they started charging me every month. Charged me 3 times $40.4x3= $121.2 USD during last 3 month. They doing it silently, without any invoice or any email.
I contacted them in 3 ways, contact form, phone, email.
I talked with a person named Deepak Tyagi, who told me (at 20 Aug 2017) that they will take care of it within 2 business day and the money will be refunded. But till now they didn't done it. And yesterday they charged my card again.
Also, looks like they don't have any customer support person.