I can't change my phone number in UCAS Track !

I have realised my mobile number is not on my details in track, and I don't know if I need to add it so universitys can contact me, and if I do they have suspended changes to the application until tomorrow (the 18th). I tried ringing but there wasn't a service to help me. What do I do ?? Could I add the number early in the morning ?

Call UCAS today (
0371 468 0 468
) - they'll be able to amend it over the phone

Track wont be fully functional tomorrow morning.

i did and none of the options it gave me where to make changes to my application :/

According to https://www.ucas.com/corporate/about-us/contact-us/ucas-undergraduate-telephone-options you just need to hold to speak to a human