Karbonn — services of karbonn

Address: Hyderabad, Andhra Pradesh

i've brought karbonn a11 on 5th feb 2013 after using the mobile for 15 days the data connection was not connecting
As i brought the mobile handset at sangeeta store the store gave an offer of providing free services for a year
after getting my mobile after servicing the problem is repeating repeatedly
i asked for replacement of handset and i got reply that only within 15days of buy exchange of handset is possible, so
i want a replaced handset or the problem should not arise again in my karbonn handset