FRONTIER AIRLINES FLYFRONTIER.COM Not given credit for cancelled flight due to Covid-19 Nationwide

I have been trying to use my flight credits from a previous flight cancellation due to covid-19 and the website continues to say there's an error. One of the flight credits is under 1 confirmation # and the other is under another 1. The total cost of the ticket was $512. Their website is not allowing me to book online. When I call to check on this I stayed on hold for an hour on June 10 and when a rep was coming on the phone finally it gave me a fast busy.  I was on hold for well over an hour 8 hours total as I've tried to handle this matter.  Looks like for the other confirmation I'm owed $148. I called back today and the rep said she was working on my issue and that she needed a manager to help with it and while on hold she hung up on me.  She did not call back.  Now I am on the phone again and it's 30 minutes in on a call that has been averaging well over an hour.  The worst part about it is I can't use the website because it's crashed and will not allow me to try and book a flight with my other confirmation # that does work.  It expires tomorrow, June 12th and I can't even do anything and they don't answer. I have a confirmation that showed the full amount is supposed to be $512 but the representative said they put my credit into miles instead of cash.  When I try to book with miles there are so many flight restrictions that don't work for my departure and return.  WEll that's prior to the system crashing. Now I can't see anything.  It's just freezing up, a spinning wheel when I try to select a departure date.