You are not a nuisance. I always try to help if I can. I would not in this instance call them or write to them. Let's see if they get the charge sheet wrong as well. That is sometimes more difficult to amend if the fundamental description of the offence, such as the date and place are wrong. Sometimes it's better to keep quiet and not do the Crown's job for them. I hope that helps. Please leave a positive rating so that I am credited for my time.