As an update on my issue with a hairline crack to the screen that I am 100% sure was not caused by anything I did. As seen with many comments, the position with Microsoft ONLINE is to offer to replace the screen at a high cost, implying that you caused the damage.
I ended up taking my Surface book into the only physical Microsoft store in Australia. I have to say, speaking face to face with a MicroSoft person was excellent and they agreed the issue was a product issue, as they had seen this before. The store was brilliant and they REPLACED the laptop. I expressed my displeasure with the ONLINE people. I can't speak highly enough of the store people. Hope this may assist some of you. Good luck