I bought my friend a white lavender reed diffuser from the White Company. It smelled gorgeous and she loved it but nearly half the bottle had evaporated within a month. Took it back and exchanged it for another one and the same thing has happened again. It’s in a cool room and not by an open window etc. Am going to return it again but thinking of getting a refund and starting again elsewhere. Any recommendations for a longer lasting one with a noticeable smell and which costs around £20-30.