false adverti*****t

i purchased a homemark solar light 3 weeks ago. Product advertised on tv as 10 hour lighting capacity. Fine print advertises 6 - 8 hours. The lights worked for about a week. They now switch off after a few hours. Not home mark nor game can assist. The sales rep Cindy has no clue as to correct time of how long it will stay on. She says after reading box, that it should stay on 6 hours. The home mark agent at their h.o Nosipho says 9 hours. These people are obviously not trained to sell the product. When purchasing they tell you 10 hours operating time and now that it dont work no one is willing to help.