Welcome to the RingCentral Community

Thank you.

I have been trying to get hold of RC for 3 days now and no luck. None of my Cases are attended to.

Do you know how to create a new user and give that user another user's RC number with a new extension. And then removing the other users RC number.

If you want to set it up in the website, go to your RingCentral site, Settings > Call Handling & Forwarding > Settings and edit Call Flip. You can set up a "Flip" shortcut by simply dialing *1 or *2 , etc. and adding a phone number to that shortcut.

After you answer, one of the buttons showing in the app is Transfer.  Click that and then enter the number you want to transfer to.  You can choose to do a warm or blind transfer.

https://support.ringcentral.com/s/article/RingCentral-Phone-Transfer-a-Call?language=en_US