Vodafone India — i can't get refund security deposit after conversion postpaid to prepaid conversion

Address:

721426

I m rajib dhuya, holded vodafone postpaid number: [protected] with freedom 199 plan,
I got converted in postpaid on november'2015 against which security deposit was of rs.300/- which i was supposed to get after 45 days after leaving postpaid connection, now since more than 120 days have passed i have not received the same, on contacting customer care they say to visit vodafone store, after visiting vodafone store they told me that we will sent the cheque to my adrress. But still i have not gotten the cheque. Please do needful as soon as possible.