I've been stealing little squirts of testers all week so I could decide on a new perfume, and in the end Givenchy's Le Secret came out the winner. I've tried it on for 4 days straight, and the tester was lovely. I splashed out on a bottle of it today and am so disappointed- it just smells stale on my skin :( I got in from Boots, is there anything I can actually do? I'd prefer not to have wasted 37 quid, but I don't know if I can take it back now it's been opened, or if they will even believe that it smells different. Any advice?