Pure It Of Hindustan Lever — change of battery

My name is Dilip Kumar I have purchase a Hindustan Uniliver Pureit in nearby 20th April. From your advertisement we have known that pureit gives us 1500 liters water as save as boiled water but within two months our germ kill battery has became red. In the pureit warranty details you assured us that in addition you cover the customer with a 6 months warranty against manufacturing defects & my case is nothing but a manufacturing diffect because two months maxim 700-800 liters water is used in our pureit filterso it is your responsilibity & duty to replace the baterry in free of cost & save your companies warrenty niether I shall published all the details in my city & that can prevent your companies good will. So replace the battery as early as possaible.
Yours faithfully,
Dilip Kumar,
Ph.-[protected]
K. 16/27, Hathi Gali
Near Kal Bhairo Temple
Varanasi ( U.P.)