So this is a niche topic, so what?
Frontier gave me a $100 voucher recently because they canceled my flight three months out.
The voucher kept failing to apply when I tried to use it today, so I saw no choice but to call them up and try booking the flight by phone.

I’ve used Frontier vouchers before, but it didn’t work this time.
Frontier’s call center is open 24/7:
There is a $10 fee for booking over the phone, but that is waived for elite members.
As a reminder, here are the elite benefits:

All this could be yours. Just survive flying 20k Frontier miles in a year.
So I call them up.
You enter the initial details of the flight (dates, destination, # of passengers) with an automated system, then you wait to speak to a representative.
After about three minutes, a nice fellow came on the line and confirmed all my flight details.
After he told me the price, I let him know that I had a voucher, and that I was an elite member so the $10 phone fee should be waived.
After a brief hold, he took down my loyalty number and waived the fee with no issue.
After another brief hold, he asked me my seating preference.
For some reason the seat I wanted in Row 12 wasn’t appearing as a free option for him, even though it did for me online (as an Elite member).
He booked me a window seat in Row 5 instead, and I was able to edit it to Row 12 after the booking was complete.
I’m not sure why, but he was able to successfully apply the $100 voucher.
It’s possible it wasn’t working for me online because I was selecting that Row 12 seat that appeared as unavailable (or not free) in their back-end system.
Out of curiosity, I asked him where his office was located.
“We’re all over the world sir, but I am in South America,” he said.
“Oh cool, which country?”
“I am in Colombia.”
He sounded happy to answer a question that wasn’t related to a booking.
In total, the call took 28 minutes, but it was worth it to save ~$250 flying across the country.
I don’t know if I’m the luckiest guy on earth or what, but I continually fail to encounter the horrible customer service from Frontier that you hear about in the news.
Frontier is an ultra-low-cost carrier though, so there are technical glitches more often than with the bigger airlines.
Sometimes that’s a good thing (mistake fares), sometimes that’s a bad thing (website doesn’t work, so you have to call in).
Want to read more about Frontier? Check out our Topics page here.