From menthol to plain in a green box

Hi. I just bought a pack of LD Menthol like i always do. Opened the pack and took out the first draw and to my surprise there was no menthol taste. Had a second one hoping that its just my imagination and yet again no menthol taste. Least to say i bought menthol but has a plain taste. Now how do you return a pack of cigarettes to a shop that is defective.