Bought garden lights at this shop and they only worked for one day and going back to them was told lights have no guarantee

Bought garden lights at this shop and they only worked for one day and going back to them was told lights have no guarantee. Very shocking that they don't tell this to their customers before selling them so it becomes customers choices whether to buy or not buy. I was also told to buy a a charger to change batteries. I am talking about new lights here. After putting up a fight globes were charged on the 2 x lights last week and one light worked but the other one only worked one night. I find this totally unacceptable. I find this to be a total ripp off to customers. U don't buy something and arrive home and a product doesn't work. Very dissatisfied with Builders warehouse and their products.