Consumer Redressal

We bought a 3 door refrigerator Model no GL-M393YSJ on the 8th april 2014. the LG representative comes in the next day to give a demo and set up the fridge. 2 days later we notice that the food is getting spoilt in the centre fridge section. After this the representative came twice to change setting and the 3rd time he said he was out of town so we need to register a complaint. we did on the 25th april and after that a different representative came in 3 more times and then told us that there is a fault in the fridge and it needs repair / part replacement. we told him that since it arrived defective we would not consent repair and want a replacement for the entire fridge. he agreed and went back,. after that its been a nightmare dealing with LG. First they asked for the serial no and they needed a picture... then the invoice.. after sending the invoice too absolute radio silence from their end.. every time i call to find out the status they have conveniently forgotten about the case