They not only answered in 1 day, but also provided a real solution / workaround for our issue, as well as a technical answer to the questions and a technical analysis of why the bug occurs.
Outstanding support, and I would never have guessed it from their website.
If L1 can solve things for you, a call sometimes can work, but really, if they can't, it meant multiple calls with L1 and multiple calls with L2 (in one recent example, it took 4 months for an issue to be resolved by internal support at BigCo where I was repeatedly asked for the same screenshot, including them recording me get to it a number of times, until I pinged their manager's manager via email pointing how they have the solution in there if they only read my emails, and got it resolved 2h later).