Okay, so if this is only about a single case of "yelling", then even if true, I don't see how that would constitue "bullying". I think they would need more than one example to justify dismissal on those grounds. Also, remember that there's always two sides to every story, and clearly that's the case here considering the boss wouldn't even listen to you.
If you end up pursuing any action in regard to unfair dismissal, then you need to assume that they will defend themselves by claiming dismissal was justified. Since there is an allegation of bullying, I would start thinking now about anything at all from the past that they might bring up to show a "pattern of behaviour". There might be some things that have happened that you consider trivial or not even relevant, but you should assume that they will bring up anything at all to support their case. So write down anything you can think of and then evaluate how to go about challenging each item you come up with.
Given that they offered "2 weeks", it appears that they definately consider the relationship terminated - but exactly how that occurred is the question. So in regard to that and whether or not it was "abandonment", it looks a bit tricky and out of my depth, so I'll leave that one in
@Rod's hands.
