Dim despite a full charge

I am extremely disappointed in this product. I utilized a Magneto Lamp for years. After the first one stopped charging, I opted to buy a new one given that I received years of use out of the first one I purchased. This was a mistake. I purchased the new item in July last year and despite using the item according to the instruction manual, the light is dim. I charge the item after every use as indicated and I do not even use the ultra bright mode. Yet, the lamp is of no value to me anymore because it is so dim. I registered my warranty but I am all the way in the Southern Suburbs. Why can't I return the product at the establishment I purchased it from? Why do I have to go all the way to Airport Industria?