Bought my train tickets months ago online for berl...

Bought my train tickets months ago online for berlin-copenhagen. Seats were automatically assigned but 2 were seated at different section. Emailed them right away and was told I would to get to a customer service center in Berlin to get corrected. Flash forward to today when I'm actually at Berlin hbf db office. And after waiting a good 20 minutes, service lady said she can't change it and that these seats are close enough.