Try this number18882422100. Upon calling the number, you will have to wait a couple of minutes for the automated messages to finish before you can select an option, after that you can select 2,1, 1, 2, 3 then your application number and year of birth followed by # then 1. You will have to wait till it gives you option to press 0 to speak to an agent. If its taking longer you can request for call back when they provide you the option.
Thank you so much for this information! I managed to get a hold of an agent who told me that she could see the file but it couldn't be linked yet as the AOR was still temporary, just have to wait and see. Am a bit confused since the online sheet tracker showed most October applicants receiving a prospective app number around 10th December, 2020 (after a biometrics email in October, which I only got in December). Not sure if that means others got a number that allows them to link their file or not yet. But from the looks of this thread it seems like most October applicants are still unable to link yet?