I am used to it by now, I call the number, put it on speakerphone, go about my business. Sometimes I give up, if I have to shower but have been known to drag the phone to the bath LOL. If they still don't pick up and I have to leave the house, I leave a message to call me back and hold until I return, your call is important to me. Doesn't change anything but let someone no how I feel, at least that person gets a good laugh for the day. Customer service is not a always a fun job, many of these people are not happy that there are not enough people to handle the call volume.
I try to never take it personally, if I need to give someone an earful, I ask for a supervisor, at least they are being paid 10 cents more an hour to take the abuse. In the good old days, supervisors were rewarded, they knew all the procedures to get problem solved. No more, they only know how to say Yes Sir, Yes Mam, but have not a clue to fix your problem. Just save the time and aggravation, send a letter or an email so you have documentation to confirm the communication. All the companies don't like it if you have documentation, lawsuit anyone????