Sony India — delay in repairment of phone under warranty

Address:

Jalandhar, Punjab

i have given my sony xperia z for servicing at 233/1, SUS nagar, near preet hotel punjab jalandhar-144001 before 7 feb 2015.since then i have gone 5-6 times at the service point on their call . they gave me dates on which i can collect my phone but whenever i go to the care they postpone the date. i have gone 5-6 times and till now they are changing the dates.