Phone and emails only thank god, I couldn't do it face to face.
I've been there and I sympathize.
Often they are nicer on face to face, well guys cause they are just more chill, and most women cause I'm a half decent looking guy

It's also more difficult to "attack" the person on face to face vs the company itself.
Unfortunately I know what it is to be worn out by people, having been treated like s*** so often, lied to so much (I used to have to dig into people's financial life, EU rules compliant, and lies to simple questions are very easy to detect)...so much that you stop caring for the people and are just acting like an emotionless machine, only putting people and business in delimited cases relevant to the job, and loosing the human factor.
Before reaching that point where most humanity and compassion is lost, please try to move on to another position where you will happier. I know it's easier said than done

Or try to focus on the nice interactions you had with some people during the day, cause fortunately not all customers are ******e, even when they are upset for whatever reason, delays, mishaps, etc (in the current situation, we are unfortunately kind of getting used to it...).
Anyway, that was my story. One day, one customer too many, I said ffff it, quit my 9 weeks per year vacations, full of perks position, and changed country. All I can say is things may not be better now, but the shortcomings are different. Green/greener..no, but different.