Sf Sonic Battery — battery failure and not change

Address:

Mathura, Uttar Pradesh

i have bought a exide sf 38b20rd battery s.no 521264 of rs 3300 from paras battery wide inv no 292 dated 21/08/2010.
on 13 june 2011 our car dealer test the battery and give a test report to us to replace the battery
from 13/6/2011 i have visit so many timees to the saller of battery to change the battery but he denied to change
i have feel very trouble with all of this