LG Electronics — warranty period wasted with negligence of service center

Hi

Since my daughter purchased her split AC, She is facing cooling problem.
She purchased an LG inverter AC model no. JS-Q18NUXA2 on 4th June 2018 from Veer traders Roorkee vide invoice no. LGBSCL 18'19/0107 dated 4th June 2018 and got installed same day. The AC stopped functioning on 14th and complaint was raised on 14th Sept. 2018 and again on 15th September. 2018 and compressor was changed by sevice centre Roorkee. AC again stopped cooling and complaint was raised vide RNP[protected] on 6th may 2019 technician visited and informed that gas is less in compressor and left. Complaint was again lodged vide RNP[protected] on 31st May 2019 technician again visited and simply cleaned the unit and said that gas is OK without topping up. But AC again was not cooling properly. Complaint was again raised on 3rd June 2017 vide RNP[protected] technician visited on 4th June and left without doing anything saying that he will again visit on 6th June 2019 but he never turned and closed my complaint from call center itself. Complaint was again raised on 7th June 2019 vide RNP[protected] for which I was informed that my call is closed due to voltage fluctuation which is absolutely not their as we run many sensitive instruments in IIT roorkee and voltage is well stabilised. Then I contacted regional ASM roorkee Mr. Vipin who very kindly rescheduled my appointment and technician Mr Satish visited on 9th June and said that the machine is completely fine despite it was not cooling. He said that he will talk to company regarding exchange o[censored]nit but never returned. I again talked to Area ASM on 14th June 2019 and appointment is fixed on 17 June 2019. I am afraid they will not attend properly on 17th because of their casual behaviour. Every body except expert engineer from service centre says that AC is not cooling. Because of their casual behaviour the warranty of AC expired on 4th June with none of my fault. It is requested that service centre may please be asked to be serious on complaints and get AC property repaired or replace if not working. I bought the AC because LG is a reputed brand but from service centers casual approach I am disheartened. Kindly help else I shall be forced to approach consumer court and social platforms. I hope L G officials will understand my problem and resolve the issue. Further no customer satisfaction was recorded by technician. I have made more than 20 requests and more than 10 different engineers have visited my place, few said its fine, few said they would come back again with their senior, few said there is a faulty component which has to be replaced, few said that their regional service manager is travelling now a days and they would come back in next week.
I am fed up of entertaining incompetent engineers, who come without any solution, take rest, take some water and juice and at times tea / coffee and go back with promises.

I wish to escalate this to some senior and competent authority but every time I call up customer care number (which is there at the website) I again go through the very same experience.

Now no one even visits for inspection as all these (local / area) engineers must be feeling that they are incompetent and cannot do anything on this (at least that's what I feel).

Please help me with escalating this as I am completely clueless on this.

This product wss very much under original warranty when I started complaining but due to negligence of service centre expired on 4th June 2019.
Parul