i've had a good long think and i've come up with another possibility. i'm confident that this is what arek was thinking of
you will need a fax machine, some tape, the fax number of a business you dont like and at least 9 pieces of paper. you will also need some way of getting around them blocking your fax machine, i'm sure this cant be too hard
first, you print or draw random rubbish on the paper, bonus points of you draw a penis.
next, you stick the paper together to form one very long continuous piece of paper.
then you start sending this through the fax machine to the business you hate. when it is part way through stick the two ends of the paper together.
this should get you a long loop of paper that will roll round the fax machine forever
leave this going for a while and then inform the business of what you are doing, and that you will only stop sending the fax, and therefore stop using their very expensive fax paper, if you are paid £1000.
when they realise that you're stopping other faxes from coming through and that you'r more than happy to let them burn through more than £1k of very expensive fax paper they will begrudgingly pay up
once they pay up move on to a different business