Ages ago now, but I was collared in central London by a 'chugger' for a charity for the blind - chuggers were quite a new thing then.
I did sign up for a small monthly donation, but declined to give my age or phone number, on the grounds that my age wasn't relevant (I knew they only wanted it for pigeonholing/marketing purposes) and I certainly didn't want anyone ringing me.
The chugger didn't object.
However soon afterwards I had a letter from the charity, saying they were 'unable to,process your application' without this information!
I was stunned by the cheek of the wording - as if I was asking them for money, not the other way around! The letter went in the bin, and of course the monthly fiver came out of my account anyway.
I really should have replied with something like, 'In that case I'm sorry to say I will have to cancel the direct debit.'
But it was a bona fire charity, so I didn't.
But I do wonder how many people would meekly have complied.
I dare say some psychobabble expert would have told them that such wording would make most people comply.