Latest catalogue arrived with an insert offering 10 per cent off because I haven't bothered for a while plus a prize draw for filling in their online questionnaire. As an alternative to doing some work, filled in their questionnare. There's a button at the bottom entitled 'don't send me any more catalogues/I'm dumping Johnnie'. 
The copywriter who came up with 'I'm dumping Johnnie' deserves a pay rise.