BSNL — Regarding didn't get security deposit after cancellation telephone connection

Address:

Anand, Gujarat, 388365

My name is parimal asodiya my bsnl telephone number is[protected]. I have canceled my phone connection on december 2015 but still today i dint get my security deposited cheque. While purchasing telephone connection they charge me 600 rupees purchasing charge. But when i cancelled phone i have given instrument to bsnl so also refund me 600 rupees instrument purchasing charges and 500 rupees deposite charge..