Tata Cliq - Not returning the product despite incorrect product being delivered

I ordered Voltas *.* Ton * Star Copper (BEE rating ****) *** LZH Window AC (White) on *.*.** from Tata Cliq and the product was delivered to me on **.*.**. Once the order was received we contacted customer care regarding the installation of the product as we did not receive any calls regarding installation. Finally, we were given contact number of the customer service centre and then get got in touch with the installation guy Ali ( **********). Ali asked us to send pictures of the window in our home where we would like to get the AC installed. Once we sent him the picture he called and informed that the product cannot be installed on the window as the window and AC's dimensions do not match and also the window was grilled. As summer is at its peak in north India these days we cancelled the product thinking it cannot be installed and ordered another Voltas Split AC from another e-commerce website.
Once the request for return was initiated there was again no response from TATA Cliq until we again got in touch with Tata Clq customer care and asked for the status of return and refund. I then contacted their insensitive customer support who gave me numerous excuses not to return the product. The return policy too does not say that the product cannot be returned. I escalated the matter and wrote a detailed mail to their higher management csmanagement@tatacliq.com. After a lot of insistence, they got in touch with the installation guy and provided us with a worksheet in which it was clearly written that AC not ready for installation as dimensions do not match that of our window. Job sheet was provided even though the installation guy did not visit our home. Matters, if escalated to csmanagement@tatacliq.com, are promised to be resolved within **-** hours. However, I received a response after * week. Now they have closed the case stating that the AC cannot be returned as it is not in their return policy.