Apex Services India — service of the kent ro is not satisfactory

I called Apex Service Center for technician to Installation and service of my Kent RO on 05.08.2018. Next day Mr. Ajay bearing Mobile No. [protected] visited at my house to installation and service, he told me that their firm is authorized by Kent Company and after service I took AMC Vide Bill No 2969 dated 06.08.2018 against Rs. 6000/- from him . After his visit, I found that RO was not working. Then, I again called Mr. Ajay and told him that in RO Sensor is blinking with Red Light and also called their customer care. After 3 regular visits by Technician Mr. Baljit bearing Mobile No. [protected], my RO is still not working. This is very shameful to the Service Center that they have unskilled, unefficient technicians. When i talked in Kent RO Company and asked about that what their company has authorised Apex Service Center for service of their products. They have replied that their company has not been authorised Apex Service Center for installation and service about their products. Now, I understand that I was cheated by the technician of the Apex Service Center. I want to know that the service center can solved my grievances. If they cannot provide me relief then anyone can suggest what will be remedy of my problem. I also think to go in Consumer Court against the service center, if they do not provide me relief or refund of amount of Rs. 6000/- as they have cheated me and not done service properly.