There is no need to send anything. Just go and do what they want because there not going to change their minds and you have a deadline. By the time you get a response from them, your deadline will be very close so do not waste your time.Thank you.
They were also asked for a new medical exam while my old medical which we made all together was prolonged. I can see on IRCC webpage, that people who haven't left Canada in last 6 months do not need new immigration medical. Should I write a letter pointing this out to the VO?