I had the same call this week harri, I let her ramble on about how my computer wasn't downloading anything because someone was trying to hack it, then I told her I didn't have a computer.
It was a bit of a novelty for me as I never answer random calls 
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The first time I said "I don't have BT internet" only to be told BT is the parent of all internet providers - "Ma'am don't you know that ma'am?"