I have verified your information and I'm happy to inform you that I have successfully removed your old phone number from your Razer account as an Authenticator. I suggest setting up a new one to secure your Razer account by following the steps below:
1. Log in to your Razer ID account. 2. Select 2-Step Authentication under Security. 3. Enter the code sent to your Razer ID email. 4. Set up your preferred 2-factor authentication method.
Or you may enable an authenticator App for Razer ID. Here is the link for the guide.