Indian Railways — delay in refund

Sms received on 21.09.2017 that train no 07150 njp-vskp schedule on 02.10.2017 was cancelled due to unavoidable circumstances. But i have not received refund of rs 2235/- vide pnr no. [protected]. I have requested three times vide ticket id irctc # 6865901, 6901485, 6950553 & attached sms (Train cancellation) also. I have talked two times to customer service. They have informed that it is being looked after. Please refund the amount at the earliest.