2FA has made it impossible to log in to my account calls

So I left Canada a month ago, and I put my phone number on a seasonal hold plan, for something like $15 a month. Long story short, I now want to fully cancel the mobile number and the account etc. but when I try to log in to Koodo now they’ve added a 2FA...which requires an active number…which I don’t have...because the number is on a hold...and I am not in Canada. I am in the UK, my Canadian e-sim is switched off. There is no way for me to receive texts or calls on this number. When attempting to log in there’s also no option to verify your account via email. Only SMS. I’m now basically locked out of my account, and I’m being billed for a number I am trying to cancel/deactivate, and I have no way of accessing the account or closing it.