I've just tried a new one, Some gentleman with an accent I could not possibly describe tried to talk, so I said, "sorry this must be a bad line I can't understand you, can I give you my other telephone number?". He was over the moon with gratitude, "have you a pen and paper?" Yes he has, "0845 300 44 XX", He hung up with the promise to ring me straight back, I wonder if he really did need car insurance?
