I think I'd ask what are you calling and emailing them about? If there is a job, there is a procedure for requesting it and requesting a bonus so you don't need to email or call about that. If there is no immediate urgency to your question, they may have just not gotten around to answering yet.
If you're in the midst of a job and have a question, then that would be very disturbing if they're not answering, but if this has been going on since Monday, the job is likely past deadline by now.
So it's hard to tell if this is an issue without knowing what you're trying to reach them about. Have you been able to self assign previously, and now can't? Self assigning is an option that is earned, but I can't remember the criteria. If you're requesting shops and not getting them, that generally means a more experienced agent also requested the job, or was able to self-assign and you couldn't.
Time to build a bigger bridge.