If you are using a VPN they know the IP address of the VPN server you are using, not your IP address.
There is no way to link the Virtual Private Network IP address assigned to your session by your VPN provider to the IP address assigned to your session by your Internet Service provider.
A VPN is an anonymizer.
Question: If I am in Mumbai, India, and using a VPN, no one will know that I am in Mumbai. But will they know I’m in India? Or will they possibly be told that I am in Germany? or Japan? It seems highly unlikely that the IP address will resolve to, say, California. But I’m not sure how it works.