Was called on this number by an Indian lady from Thames Water's call centre regarding a very specific issue to do with my water meter that I'd requested a call for.
Indian lady called Prithvika saying from Thames Water - was dubious so didn't give any info. Hung up and called Thames Water on their main telephone line and gave the reference, was actually legitimate in the end. It was from their indian call centre. Still feel better hanging up and calling them direct.
It's dangerous to answer the caller ask for proof of address, my family so afraid of let the indian tone, unclear language speaking lady, the police must trace the source of the caller to avoid the vulnerable people of further sufferings