Shocking Woollies Spam Onslaugh

In the last 10 days I've been blasted by completely unwanted spam from Woolworths, I've never had so many messages from one spammer (8 - almost every day) and I don't want any of it. I just want the messages to stop forever. I've put my name down on opt out databases but Woollies doesn't seem to care. There's no OPT OUT option on the SPAM and it's coming from different numbers (probably **** numbers) so I can't block it