This is easy to say but can be difficult in practice. Even if they did provide a phone number, there's still no guarantee.
Any business is going to have to depend on multiple individual providers, any one of whom could inadvertently shut you down. Your bank, your energy supplier, etc. Trying to mitigate for such scenarios is near impossible as a small business. It's worth remembering the flip side of the current story. This individual was able to sustain their family and two employees from this business. That's impressive. That an innocuous change on one device can have such a negative impact, with no warning, is a heinous oversight on Amazon's part.