Discovery Life gives me unnecessary stress 😭😭😭

I have a big problem. I have been struggling with the login as a OTP would be required and it goes to an old nr. Been emaiing/ calling and Discovery keeps telling me it has been rectified. Now I received a email advising that my cover has lapsed. How do I pay the fees when the OTP goes to the wrong nr. Please tell me, what has to happen now. I'm defeated