One of the biggest challenges that I have faced in my last job, this customer had a fencing install, but everything about it didn't go quite right and the customer started being condescending and judgmental at the start of the call, but I was able to turn it around and make him understand that I'm there to help him and then he calmed down and accepted that I know how to do my job and that I am able to support whatever assistance he needed and he decided to ask me as the contact person to help him to assist on his install job.