As for support I have always found Heroku to respond very quickly. And they do have direct support. https://www.heroku.com/support
"Heroku Support is currently closed. Normal support hours are 9 AM to 9 PM Eastern time. Our goal is to respond to your inquiry within 1 business day. Please note that it may take longer depending on current volume. Running a critical app?
Heroku's Premium Support offering includes a 24×7 Response SLA and more. Please contact us for further details."
When it is Heroku’s fault (couldn’t access my account with cryptic error message) it is very annoying to be suggested to use paid support, for a product that is already costs more than alternatives.
And what are you comparing to here? Are you getting instant 24x7 free support from any other vendors? It's quite normal to pay for support in this industry.