Number in the machine

Trying to get my tax certificate. I tried to login to discovery and there's a 2-step verification that supposedly sends an OTP to my cell number. Except it doesn't. So now I sit on the phone with Discovery helpdesk listening to classical music while a voice tells me that the consultants that aren't coming onto the phone with me are apparently very skilled...just a pity they're too busy to answer my call. How I sometimes adore the modern world!