Croma — Regarding AC Installation Charges

I Purchased Croma AC online and before installation I got a called from Croma care and he told me you have to pay Rs. 250 as installation Charge. After Installation, I paid Rs. 250 to technician. Now After 10 Days, Again I got a call from Croma and he said your Installation Amount is still pending, I said I already paid, he said Your Installation charge is Rs. 1499 + 18% GST, So total Amount is Rs. 1770. After that I called many times to Customer Care but No Response from them after that I mailed to them many times by including Nodal & Grievance officer but still No Response. After that Again I called to ask If Installation Charge is 1770, then I already paid 250, so it should be Rs. 1520, but he said No, Total Pending Amount is Rs. 1770. And then he told me the Amount you paid that is for Stand Fitment Charge. I really got frustrated. I got lot & lot of calls for the payment of Pending Amount. But Croma Care didn't even responded. Now I don't have any option so planning to pay that amount but before that I'm raising this concern over here...