How do I access the "Dedicated phone line for technical support" available to TurboTax Advantage customers?

The reason I use TurboTax Advantage is access to the dedicated phone line for technical support. 

 

After search for the answer in Help and Community, I dialed the basic customer service number. I had to get through the frustrating voice prompts after multiple tries and it not being able to understand me. I waited forever, and then got hung up on twice. Awful experience.

 

When I needed to use it last year, it was great. And that justified my continued participation in TurboTax Advantage going forward.

 

Thanks!