I already filled out the survey a while back, but just wanted to let you know how valuable your help was. As I mentioned in the survey, you were incredibly kind and professional, and you really put my mind at ease. Also, I've never dealt with anyone who was as prompt in following up with email information
and who laid out the necessary steps for me in as clear a way. You were a godsend, and I can't tell you how much I appreciate your help during a very stressful time!
If you'd like to forward this to your supervisors, please do! And of course, if they want to contact me to confirm how impressed I was with your help, please feel free to give them my email address or phone number. They're lucky to have you working for them!