Cake Wallet's Support is the model.
Customer service at company's and organizations usually sucks.
Cake Wallet's should be the industry standard.
Yet another reason why banks suck. 
Discussion
The only company I found that came anywhere close to cake's customer service was called Ting Mobile, which was an MVNO. They still exist, but they were bought by Dish Network, and I figured the customer service would go down the drain, so I left.