How do I upgrade PS3 Digital Copy to PS4

Hello, I've been in contact with DA:I support (livechat) and Sony (livechat) trying to find a way to get my digital copy of Dragon Age Inquisition from PS3 to PS4. My PS3 is basically a paperweight now, so I am unable to access my game - but I recently bought a PS4 and found that the game is available for both. I realize there is a backwards compatibility issue and to overcome this issue I've been selling all my disc based games to put toward PS4 games - however I don't see any option to do so with digital copies.

This is one of several cross-platform games that I need to contact different companies about, so getting bounced around through support is going to get extremely tedious. This is the forum I was told to come to by the live chat person, so it is not my first stop. I appreciate any support in resolving this extremely simple situation. I place the blame on Sony for not providing backwards compatibility in their PS4, but how difficult can it really be to trade in a digital copy?

I would prefer to do this in e-mail or on the phone so I don't have uninformed people weighing in, but this is where your support people sent me so I'm going the route your organization has led me for your convenience - if my efforts don't yield any results, I'll find other means to contact corporate level assistance.