Sony India — Not repairing my laptop

Address:

Meerut, Uttar Pradesh

my laptop is not working properly so i gave my laptop at the sony authorized service centre, 4, nehru road, near kehchari, meerut, uttar pradesh on 26 june 2015. the complaint job sheet no is J51558013 and model no. SVS13112ENS IN5 serial no. 7000551. my laptop is under warranty. they said to gave my laptop back by repairing in 10 days. i called up them number of times but everytime they gave me excuse. i waited till 21 july 2015 but they didn't respond. on 21 july 2015 i sent a mail to [protected]@ap.sony.com
i got a mail next day with an assurance to do my work. but still they hadn't done. this is just unacceptable.
its about 33 days, i still get my laptop repaired.
my laptop's warranty will be expired in september, are they waiting for the expiry to extract the money. resolve my problem as soon as possible.
thanks
vivek singh - [protected]