If you want to get immediate assistance from Frontier airlines, you can go for this method. Just call the Frontier airlines customer service team. Here is the step by step process that you need to follow if you go for this method:

Dial the Frontier airlines customer service number.
Then, you need to wait for a few seconds.
You will listen to an IVR system. This will assist you in pressing the number as per your requirement. You need to listen to this automated voice system.
Once you press the concerned number, you will get in touch with the live agent at Frontier airlines.
Now, you can share your problems with the agent to seek solutions for the same.

Also, you will have to choose the language in which you would want your frontier airlines agent to communicate with you. So, you now know the method to call the Frontier airlines customer service team for help.
Source: https://manageairlinesbooking.com/blog/speak-to-a-live-person-at-frontier-airlines/