I was approached to create vector files of their existing logo for their window signage. I sent a ballpark figure through to them and it was approved. I started to work on the files and realised it would take a little more time to complete due to the complexity of their logo. There was an additional hour of my time charged at $50.
I sent them an email explaining this, they said it was fine and thanks for letting them know. I completed the work and sent the invoice with the files due to their tight timings. They then ghosted me and have ignored all of my emails and attempts at communication.