PAY to stop spam messages. New income scheme?

Got Another Auto & General spam sms. I did not subscribe and always make sure I OPT OUT when doing anything. <br> So the sms says that I should reply stop to \opt out".<br> This I do....and they charge me normal sms rates (80c). <br> <br> My problem is that I've done this before. More than twice have I even phoned them to stop spamming me.<br> So:<br> 1000 clients @ 80c each equals R800. Not much. But numbers are bought in bulk"