Bad service

I have called Discovery this morning to update my cell number in order to link my device to my Discovery app, as the OTP was being sent to my old number. The consultant updated my number, but when I get the OTP to my new cell & I enter it on the app, it keeps giving me a message that it is invalid or incorrect. I then called them back & explained that to another consultant & he suggested I switch off my phone & try again. He also said that I should delete the app & download it again. I tried both of that but then got the same problem as before.

I have messaged Discovery on X (Twitter to phone me to sort out the problem, but my messages are getting ignored

Please call me ASAP ***