Please write an email to the CHC with the subject "URGENT: <insert your for email here>" for example "URGENT: Request for withdrawal for application". Mention in the email body full name of all applicants, Passport numbers, date of births, address, VFS reference numbers, file number (if known), client id(if known).
Explain that you need to withdraw your application as you have a PR application in progress and that you need to submit your passports against that application.
I needed my passports for an urgent personal matter without withdrawing my application and I received my passport back within 4 working days.
Good luck.