That only applies to world shattering scenarios, and neither TV show featured anything even close to that. And even in world-shattering scenarios, many heroes, such as Bucky, can only travel at the speed of bus. So the chances are by the time they arrive it will all be over.It’s not about showing up to everything, but certain high profile cases make the list...aka the stuff exciting enough to generate movies and tv shows.
No one actually has Doctor Strange's number. But there would be no need, as he has the means to detect and monitor situations like WandaVision remotely, and intervene if the world is threatened. Which it wasn't. Doctor Strange's brief is explicitly to protect the world from magic threats. If the world isn't threatened, it's not his job. If the threat is non-magical, it's not his job. His medical training makes him skilled in triage. Often the correct medical decision is to not intervene.like with Wanda vision, no one is going to call Dr Strange when an entire town is being rewritten by magic powers? At face value the answer seems to be no.