Consumer Redressal

Dear Sir,I purchased a SAMSUNG GALAXY S3 handset on 19/05/2013 with an year warranty,the BILL NO for the same is 4154411766.After two months of the purchasing date i started facing charging problem,it used to take an entire day to charge,i contacted the SAMSUNG SERVICE CENTER,my complaint number is 8433304442.as usual i was diverted to visit the service center.i did and i was told that the charger is faulty and after 7 days they replaced my charger with a new one...but after that i have been facing the same problem and to add salt to the wound i have started facing more problems like heating up of the handset,battery draining out fast,again they replaced the charger quoting the same problem.again after one and half month i started facing the same problem,i have submitted my handset to the BORIVALI(WEST) service center on 20/12/2013 and till date i have not received my repaired handset.i have written many mails to SAMSUNG C.E.O office.They are refusing to replace the handset.pls help