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I've found that threatening to visit their car park with a chainsaw to remodel their cars seems to work in a lot of cases..

Or I have told them that the mobile number they are spamming is meant to be only used to report incidents/accidents relating to herbicide/insecticide spraying worked as well,told them they where causing heart attacks due to it only meant for dire emergencies !!!

That one was actually quite apologetic and did remove that number from lists...

Or as someone else said,tell them.your an ico emoyee or police officer in fraud squad seems to get results sometimes.

Their spouting bs,so I reckon it's perfectly fair to do the same back..

One local to me,Watford area,is due a visit to their car park soon with my saw,screaming Mimi..