Yes, we had a SQL support case replied to by email, and then followed-up via phone/screenshare to have it resolved that day.
The only constant with tech support is that it's highly variable and depends on many factors. Enterprise MSDN/SQL support is not bad though and you should've gotten a quick reply if you're using the proper channels with an appropriate support plan.
The shop I came from has been a Microsoft and VMware shop for years and we spend millions a year on MSDN licensing. The support has been kinda shitty. But I’m not there anymore. I do remember in DBA meetings laughing about how crappy it is. And why do we pay so much for offshore support techs when they should be local on premises engineers.
The only constant with tech support is that it's highly variable and depends on many factors. Enterprise MSDN/SQL support is not bad though and you should've gotten a quick reply if you're using the proper channels with an appropriate support plan.