Arrogent shop assistant refuse to see factory error

Light Worx Bulbs which I bought 2 days ago, differ in colour from those I bought only a few months ago, of exactly the same type. The shop assistant refused to accept that there is a difference, although it is fairly obvious. He also refused to call the shop manager when I asked. He was also exstremely slow and arrogant. Consequently I am still stuck at home with the new white but more yellow (not as yellow as the "warm white") bulbs which I cannot use on the same wall next to the other few-month-old-same year bulbs which are bright, almost blue white.