If they send us 1 btc back instead of 60 btc, that's pretty much the same as sending 0 btc back instead of 60 btc. By your logic, they can refund us 0 btc and we won't do anything about it.
No, it's different if they send us 1 BTC and 8 BTC. They can not justify sending 1 BTC because there is no logic behind it, so they will send us 8 BTC per machine claiming it is the BTC equivalent of the US$ amount that we paid. I'm almost certain they would send us happily 8 BTC if we provide them refund request and BTC address to receive the funds.
Additional problem is we can not be certain that HashFast will survive as a company, they have serious troubles, obviously incompetent to ship anything. This looks much worse day by day, so maybe having some legal course of action is the best we can do right now. We need an advice of a lawyer, maybe Waldo should collect some lawyer fund from all of us, and find a good lawyer ASAP.