Akosha.com — koryo ac (1 ton) - unwilling to repair without charges even under warranty period

Address:

#13,9TH MAIN 1ST CROSS, BTM LAYOUT 1 BANGALORE SOUTH, CANNON CHRIST SCHOOL,DHARMARAM CLG, 560029

I have unfortunately bought a koryo ac (1 ton) from hometown jp nagar 2nd phase, bangalore on 16th may'19. But in few days in less than 3 weeks, the ac stopped cooling and i asked for a service repair or replace the product. They (Koryo) told me that i will be charged even though it is under warranty. After many calls and arguments with the customer care, i finally agreed to pay for the service of rs 900 to the technician thinking that one can't argue with the #.

One guy came and put some gas into the outdoor unit and the ac was working fine for couple of days and i paid rs 900 to that technician.
After few days (In 5 days) the ac again stopped cooling and again i called the customer care. This time the customer care told me that since the ac has been installed by some third party and not from koryo the warranty period of the ac is not valid and i have to pay for each and every service.
I told them that how i will get to know that the ac is installed by third party because hometown was raising request to koryo for the ac installation. I actually even received messages of the service request for installation from koryo customer care. And the technician told me that they are from koryo.

I told these things to the customer care but they are not understanding simply because they are #.
I thought that i am wasting time so wanted to put a consumer case against koryo and hometown separately or together based on your suggestions.
I want a full refund along with the installation amount i paid and also, compensation because of the mental assault both koryo and hometown as done to me.
Could you please let me know how should i proceed with this case?

Regards,
Parveez