Bad attitude

Hi, I recently received a reservation confirmation email from an email address *** , the attachment contained some confidential details so I felt I had to call the hotel and alert them about the error , I was transferred to a lady by the name of Mercy, she was very rude and insisted that she was just given the email address and she did nothing wrong , I tried to calm her down but she was juts rude, I wanted to ask her to get the correct email address and fix the error but she was not having non of that and she just blew me off after I used my own airtime to go through the trouble of fixing a error that could bring the hotel problems , Mercy needs to be taught customer service as she seems like she doesn't know hat she is doing there , please assist with this.