Wow Im impressed by Amazon's customer service. 10 minutes after emailing them to ask if I could swap the non-Steam version of Drakensang: ROT for the Steam one as they are now the same price, they instantly refunded me so I can grab the Steam version :)
They're pretty efficient and if they can solve something for you, they will. Not always the first time, but they have that handy screen that comes up and says "Please let us contact you to try again" - Amazon is one of my favorites in terms of customer service.
I worked at the warehouse in Dunfermline (Scotland) for a while, customers would likely have a heart attack if they saw some of the shenanigans that went on in there with customers orders. At least with their digital platform you cant use the item as a football