Call Back Service

I need to update my cellphone number for OTP and upon calling in I am told the system is currently unavailable. When asked if they can contact me back once it is resolved the agent reckons that they cannot phone the client back and that I need to call them a bit later to inquire whether the problem has been resolved.

I have a problem with the fact that it requires THE CLIENT'S resources to initiate contact to resolve these instances. I would like to be contacted by Discovery and have this resolved without having any further concerns or problems.