Consumer Redressal

I purchased lava phone from a shop in gurgaon which damaged after 3 months and I went service centre 4 times to repair that at last comany declared phone dead and proved send me retailer to take anothrr phone for that damaged phone retailer told that the model is no longer available and I was forced to purchased another model of same company and denied for change of brand.so I had to pay higer price than market price and took another phone. Now same thing has happened with this model and I am wasting my time while moving to servive centre and retailer for changing phone again and again. The retailer is denying for refund of money and is demanding higher price if I want to change brand and asking me to pay extra tax and alsocharging higer price.kindly help me