I've talked to Managed Payments a couple of times by using the phone icon that is on the right side of the screen when you are on Managed Payments Summary/Payouts on the Seller Hub. I think they only answer during business hours but if you click the phone link they usually call back within a couple of minutes. There is also the chat icon above it (which I used once and still had good luck with a knowledgable person for my question) but I prefer talking to someone in person when there is an option.
I'm not sure if you are using the app in may be different, I prefer using the main site (through my computer) when I'm doing anything like that. Good luck!
