Hi, I'm in the same boat with huawei mate 20 pro, my screen went green, preordered mine online, spoke with CS already, this issue is well known with them and they cannot offer me exchange due to no stock, offered me to send device in a jiffy bag and cancel my contract that started on 26th October and sign new contract after, got my jiffy bag delivered yesterday, will send it tomorrow, hopefully won't have to wait to long before it gets sorted.