This is of no help towards answering your question, BUT the fact you are looking to do 'further action' on your account, would imply that you want to make changes to a telephone service that you wish to continue using.
Just asking, but are you aware that landline telephone services like yours will be withdrawn over the next year to eighteen months, and switched off completely at the end of 2025 ?
Rather than spending your time trying to overcome Plusnet's long time broken web console for changing your landline features, perhaps you might want to research how to upgrade your landline service to the replacement VoIP technology that allows you to continue using your existing phone number and handset - except you will require an adaptor to convert your handset to be plugged in to your broadband router (instead of the BT phone socket).
Unfortunately, Plusnet don't provide a VoIP replacement for exiting customers with traditional landlines, so you will have to find another third-party provider and migrate your phone number to them.
If you need advanced features such as having the equivalent of 'Call Protect' etc, you will need to look carefully at what the VoIP suppliers actually provide.
The good news, is that VoIP phone calls are usually much better quality than traditional landlines, and can be MUCH cheaper.
There are several topics about this in the Plusnet Home Phone Forum, usually mentioning "VoIP", "SoGEA", "Digital landline", etc
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