I agree that have no case really. The company could argue that the received flowers weren't put into water straight away, or that plant food wasn't added - any number of reasons for the flowers dying off more quickly than expected. Roses, for example, should have their stalks cut at an angle. If you then leave them in boiling water for a couple of minutes before transferring them to a vase, they usually last much longer. The guide that Whickman gave you, is just that - a guide. No one can foretell exactly how long a particular flower might last for. I've had lillies that've stayed looking lovely for over 2 weeks, but that's longer than probably expected, so it just shows that times can vary.