I purchased Komplete Standard 15 when it was on the holiday sale and was also able to use a voucher but it was stuck on payment pending so I contacted support and opened a ticket. I asked them. Well apprently during the holidays they do not get back to you for weeks so I had to wait because my voucher code was not working anymore and the order didn't go through.
Once someone got back to me the sale was over so I asked them if I could get Komplete Standard 15 at the price I originally was offered because it wasnt me fault the didn't respond to my ticket for weeks. In the ticket someone specifcally said to purchase it at full price and they would personally refund me 50% plus 10% for the voucher, and so I did.
I then waited a few days and asked when I should expect the refund and they got back to me saying that I am not liable for a refund because of a voucher, which I didnt use. I was scammed into purchasing Komplete Standard 15 at full price.