SCAM.

SCAM.
This is a barely legal scam. They pretend to be your current supplier to get you to sign up for a contract through them.

DO NOT IN ANY CIRCUMSTANCES DO BUSINESS WITH THEM.

Re their response below.

I don't know how they've found my call in particular, without my phone number, and still havld the call recorded 3 months later.

I think it's pretty clear that not only do they lie on the phone, they have also lied in their response.