There are consequences larger than "hey, stop that."
Even Uber's legal representation said they could be liable for damages:
If Uber employees intentionally diverted Gett drivers from legitimate business by making phony calls, that is an unfair business practice, illegal under California law," he said. "It is also an intentional interference with Gett's business which makes them liable for money damages.
That's not Uber's legal representation, it's "San Francisco-based attorney Drexel Bradshaw." Nowhere does it suggest that Bradshaw is associated with Uber. Here is Mr. Bradshaw's profile page from his law firm (from a cursory Google search): http://www.bradshawassociates.com/Bio/DrexelBradshaw.php
Even Uber's legal representation said they could be liable for damages:
If Uber employees intentionally diverted Gett drivers from legitimate business by making phony calls, that is an unfair business practice, illegal under California law," he said. "It is also an intentional interference with Gett's business which makes them liable for money damages.