Yea… good luck with that! 
Did you speak with your bank? It sounds like you can make a decent case that you weren’t trying to order two copies of the same software! You didn’t try to register both activation numbers did you? I honestly believe working with your bank is the best way get your money back!
The trap I fell into was that I didn’t initially understand that AskNet was a reseller of Steinberg products, so trying to get an answer from Steinberg is futile, and even more so here at the Steinberg forum!
Al