Great Eastern Appliances — Delivery of refrigerator not yet received

Address:

Kolkata, West Bengal, 700075

I have bought a L.G. Refrigerator on 06th April, 2017 on Bajaj Finance loan from Great Eastern, Kasba Rajdanga store of Kolkata. I have cleared the down payment and all the formalities were done. Great Eastern confirmed me that the delivery of the Refrigerator would be done by Tuesday, i.e. 11th April, 2017. But still today 13th April, 2017 the delivery is not done yet. One Sales representative from Great Eastern has called me today, i.e 13th April, 2017 and she told me that the delivery of the refrigerator will be done on coming Sunday, i.e. 16th April, 2017 . This is totally unprofessional attitude of Great Eastern.
At the time of selling, their behaviour was so polite but when they received the deal, they failed to meet the commitment.

Please help me. I have the MOney receipt of down payment and Bajaj Finance approval form .