Someone at my doctors office fucked up and changed my medical insurance but put the wrong date in, which put me in the hook for the full cost of my preventive care. I tried explaining that there's no way it was my fault since according to the records, the date of my visit occurred months before my new insurance even existed. "Sorry nothing we can do about it." Yeah bullshit, that amount of money would literally destroy my life, so I kept calling both the office and the insurance company, collecting information and escalating with both of them.
Finally some amazing woman from the insurance company said, "Just give me the number of your doctor's office and I will deal with this." I did that. Then she called me back about ten minutes later to let me know everything is all set and I no longer have to worry about any problem.
I really wish I could have listened in to that conversation.