When I reported a bug in a backend component of Power BI I was called by Microsoft to collect data about the problem and got updates from support until it was fixed over the next 3 weeks. That was very satisfying because I knew something was being done about it and it wasn't sitting in a bug tracker indefinitely.

The only thing I disliked was that support tried to call my office at 3 am and then was confused I wasn't there even though I had to enter my timezone in the support form.