Welcome to the site, phuidh!
As Author says, sadly this happens. Far from being unique, it's actually a bit like buying a toaster and finding it doesn't work.
If you bought it from a good store, they should give you a replacement.
Wyrd bið ful āræd.
"Coffee. The finest organic suspension ever devised. I beat the Borg with it."
- Capt. Kathryn Janeway