Low thieves

My sister discovered last week she had had her Switch card cloned; at least her details had been used to buy £1500’s worth of goods in a week, none of which she had ordered. We know quite a lot about the perpetrators: the first purchase was a top-up on a mobile phone; the next were in Sainsbury’s supermarket; finally they spent £1000 on pre-written essays. So someone out there is preparing to sit their exam using an essay not their own that they have paid for with stolen money. I wonder what I can do to bugger up this plan.