Hello, those aren't legitimate contacts. It looks like a scammer who has simply set up a WhatsApp account using a 3 image for the logo, and choosing a name that looks like Three's.
Given that the scammer has contacted your partner through multiple contact options, it would indicate that they know more than just the phone number that belongs to her. They would need the password to access the account online, and would need access to the phone number or additional information about her in order to pass security to place an order.
If you haven't already, I'd recommend having the passwords to most of your services updated. I'd also look to put 2 factor authentication on any services that offer it. You should contact the support team and letting them know someone was and might still be trying to access your account. They can place an alert on the account.
It might be worth contacting your bank too, and letting them know what's going on. This will help them keep the accounts secure.
Pete.
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