Great Eastern Appliances — customer service / commitment

Address:

Lucknow, Uttar Pradesh, 226003

I purchased an window ac of hitachi from great eastern alambagh, lucknow

The seller made two commitments to me
1.ac will be delivered tomorrow (9/9/19) free of cost.
2. Installation will chargeable by 499/- and ac will be installed on 10/9/19.
I paid delivery boy 50/- rs for delivery and installer is asking 550/- now and it is 01:10 pm now (10/9/19) and ac is still uninstalled.
Manager and sales person behaving rudely to pay the same 550/- and saying today is moharram, so you have to pay.