Old passport history

Hi there
I am a Canadian citizen living in Canada and just submitted my documentation for the Tier 4 visa general.

I am to be attending the Imperial College of London for my MSc and starting July 2016 they have a new pilot program for its students so that we do not need to submit financial or academic documentation for the application.

I realized though after I submitted it that I was supposed to (not sure really?) submit my previous passports from the past 10 years. I had claimed on my application all these previous passports with the passport numbers and issuing authorities- so all my passport information is there. Unfortunately I did not realize I was to also submit those passports as supporting documents.

When I went back the office said since I already did my biometrics I couldn't take back my application. I would have to withdraw and reapply all over again and pay the visa fee again.

I am now not sure what is the best course of action. I know I am a low risk individual due to this pilot but I am very nervous that my application will be refused.

I did submit my current Canadian passport though which is good. But a lot of the travel I have done in the past few years have been on my other older passports as well.

I could resubmit my application and then repay my visa charge but I am not sure if this means I would need a new CAS number? I literally just submitted this application today.

Any feedback would be very helpful.

Thank you!