My brother used to own a clothing shop and as you can imagine I spent hours in there trying on every item of clothing that I even 'thought' might look ok lol anyway the point is that when he sold the shop there was heaps of left over stock and one item still has that darn security thingo on it 5 years later yes I've tried EVERYTHING to get it off. You'd think that by now I'd find another shop owners and ask if I can use their thingamajiggy to get it off but I haven't bothered. I guess one day I will. SO I think you'll need to return to the shop with your receipt to get it taken off