Tips for Getting Sideshow Bob:
1. Make sure you read through all of the "normal" tips and tricks for triggering a stuck questline and try them all first. SSB may not trigger immediately for you, but in the long run you'll be a lot better off if one of the usual methods works and you don't have to contact EA support.
2. Assuming you are comfortable explaining the problem in English, ask for a callback during normal business hours in the United States. It doesn't mean you'll necessarily get a native English speaker, but it does help.
3. Request the callback specifically for technical support for missing content and insist that either (1) the questline be triggered and force-finished or (2) SSB be directly added to your inventory. Be polite but firm.
4. Explain that you have met all of the requirements for SSB to appear and that you have tried all of the usual tricks to trigger the questline. Recite a few of them to make it clear you know what you're talking about.
5. Be prepared to be read a script that only repeats some of the tips. This is what EA relies upon when they don't have sufficient knowledge to really answer your questions. If it seems helpful to insist the case be referred to the Studio Group, do so. If not, don't be afraid to just hang up and request another call.
6. You'll never get the same tech team member again, so either make it count with someone helpful or don't be afraid to take a chance that the next tech team member will be better. Don't get discouraged.
7. Allegedly, only the Studio Group specialists have the tools to add SSB for you, but you can't talk to them directly. (Some of this may have changed from others' experiences in the past when they seemingly got SSB directly from tech support). Assuming this is true, focus on being polite and making the tech team member a friendly advocate on your behalf.
8. Be prepared to be told your case is under review and to wait, but don't be afraid to follow up regularly.
9. If you've spent money on the game, add it up and be prepared to politely point it out while noting your frustration and disappointment that this problem has been known for several years yet never resolved. Note that as time passes and your personal request remains unresolved, this approach becomes increasingly effective. EA does not want to lose any players, especially the ones spending money.
10. Keep track of your interactions with EA personnel and be prepared to recite the number of interactions, when they started, your perception of how helpful/unhelpful other reps have been, etc. The more facts you can share to present yourself as having been polite and patient while still receiving subpar help, the more likely each new rep will be to put in extra effort to help you.
11. Last but not least, don't be afraid to resort to emails with your case number included. EA controls the written record of your calls, so use these emails as your own written record.
Good luck and be prepared to wait a few weeks but to finally get SSB in the end!!