Promo code its not working

I bought 5 Nutriday c***** and when I tried to put the promo code all of them says incorrect,can you please tell me what is the matter.couse what I know you guys must be loyalty to us so we can be your regular customers but when things are happening like this I'm not happy at all. <div><br></div><div><em>(Supplier name changed from C***** to Danone Sa by Hellopeter.com)</em></div>