verify your identity

I've had about 20 emails in the last 2 days from Virgin Media O2 asking me to verify my identity. Requests made from various places across the UK on a Windows device with the IP in the message. Each IP address is different.

I've no idea if someone is trying to hack into my Virgin Media account and a little concerned. Is there anything I need to do or how do I go about speaking to someone at Virgin? No idea how to get past the chat bots or the automated system.

Thanks

Scoobs