Happened to me at work today. I started this work about a month ago. Work in period is 3 months. I was experienced in the field but the work is completely different. Lots of things to learn and since it's a multi-nation company, communication just flat out sucks. Makes it hard to learn the in and outs. My boss told me in the beginning of the work what i wrote in the titel. Today he questioned me if i ever worked in this field before. I'm sorry, but if your explanation is so shit, of course i have to ask multiple times. Either you make a mistake or you're annoying because you want to be 100% sure. You can't win.