Stayed on the phone with him for 15 min to steal a little of his time, then told him he should stop scamming people. Started insulting me, so I recalled the Hindi swear words I knew and he hung up. Called two more times right after to insult me.
I’m in Germany, so I don’t know if the numbers are helpful.
I know that UK numbers are pretty similar to those, but they should have had a country code then I guess.