Mahanagar Gas — not received refund for gas pipeline connection

Address: BKC COMPLEX, BANDRA E MUMBAI, Mumbai City, Maharashtra, 400074

I paid rs6635/- on 13/03/2019 thro kotak bank chq to mahanagar gas as connection and deposit for procuring gas pipe line connection for domestic purpose. Its almost 5 months no connection given nor money refunded. Made several calls but not received positive response req:4297498. Bp [protected] in the name of pooja vinod sachdev. Every time we call they make false promises stating our rep will visit you or call you but it never happened. Please help me in recovering my money. They have not given me any receipt on the payment made.