Strap tore at the seam - Vism Womens Concealed Carry Backpack

I bought this backpack in may. I loved it! Then in august the strap tore at the seams when I put it over my shoulder. It claims to be able to carry a concealed, however, it doesn’t seem to be able to. I’m so disappointed. I really liked this purse/backpack.
And to put it in context, I only carried my wallet, a charger, a small contact lens solution and a pack of smokes in the backpack, besides my weapon.
It should not have torn with in 3 months.