From my experience, the chat support acts primarily as a filter - they can be capable of answering more basic questions and solving problems. Some of them, however, can only paste in some links - sometimes useful, but frequently not. I have had some great support people through chat but it's usually the 3rd or 4th attempt if you're patient. Make sure you keep a copy of the chat transcript so that the next chat support are aware of your chat history - i.e. case number - some of them do search for your history. In short, you'll get a wide variety of people in chat support from useless to very good - sort of like a lottery.
However, you are just as likely to find that users have found solutions and workarounds in forums like these. If the BioWare or EA forums don't have an answer, then use a search engine. Keep changing your search terms if you don't get the answers you're looking for. There are many sites, like Reddit or computer hardware sites that have specific forums on popular games.
So as a suggestion, make a lot of coffee or tea and do a 2 prong attack - wait for chat support and while you're waiting, do a lot of searches - some of those may even help provide ammunition for when you do connect with chat support or even fix the issue.
Good luck, hope you find a good solution quickly.
Edit: And you'll have to accept that they are not going to fix everything, especially this long after the initial release. That's why in earlier games with BioWare game toolkits, users often fixed the problems. Since EA isn't going to allow a toolkit for the Frostbyte engine, it's more difficult for the tech savvy users to fix things on the PC. And it's out of the question for consoles..
And several of us (PC and PS4) are totally stuck because of the Black Emporium DLC and currently there's no fix. Presently, the only solution might be to re-install. But that's a very large download with no guarantee of success. So I've deleted the game and will check back and do searches in the event someone has a fairly surefire way of fixing. Meanwhile there's a lot of other games out there by other publishers that do care about their product after you've paid for it.