Their CS is such garbage. They denied me anything for the missing vouchers. That's fine as I should get credit card compensation. Still garbage as I was apparently eligible for the hotel but not for food like others at the hotel from the same flight...

We must inform you that the meal voucher can only be handled and issued by airport personnel. Again, we're sorry that you did not receive the meal voucher via email. Please understand that a passenger who are eligible for a meal voucher will receive a meal voucher via email. A meal voucher is authorized by airport personnel only, it is out of our scope.

Then they type some BS they copy pasted from their script, and the customer service agent is obviously misunderstanding my situation:

An option for a re-accommodation was accepted and the travel was completed. Uncontrollable Situations out of Frontier's control (such as those caused by weather, Air Traffic Control, etc.). Given their nature, we do not offer compensation for uncontrollable events beyond the re-accommodation on the next Frontier flight.

Yeah idiots. That makes a whole lot of sense when you already told me it was a mechanical issue and it's obviously your fault or you would not have given me and others the free hotel room.