Privacy Guard – Scam

My daughter recently signed up for a storecard. A short while later a cold caller contacted her from Privacy Guard. She is partially sighted and I can only assume she hadnt seen the tickbox on the contract agreeing to receive calls from Privacy Guard. Anyway she was on her way to work and agreed to them sending her "information" in the post.
She didnt realise this was a thirty day trial until approximately £80 was taken from her account. She has telephoned the company and they have told her she must have agreed to it. I am looking into it but am furious that this company preys on the naivity and disability of a young girl.
They claim to protect against identity theft - yet this is daylight robbery!