Hitachi Hli — replacement not done

I bought hitachi kashikoi 300i 1.5 tonne ac on 5th may with installation request no. [protected].The several follow ups & requests installation technicians arrived on 13th but without proper safety tools to work on height and after possible arrangements the quality of piping & insulation was found very- exceptionally poor. I sent poor piping pictures to Mr Deepak of hitachi via whatsapp. When asked for better insulation, charge was demanded, which i subsequently paid. At time of expansion valve opening, something went wrong & could only taken care next day.The installation with new changed valve & gas filling was done on 14th may .The ac went down on 17th may again. I tried to contact the hitachi person Mr Deepak & mr Dilip & even other technician via call & message for service but they did not respond. Finally I logged another request .[protected] on 19th may. Even rigorous follow up with customer care which said service in 48 hrs did not help till 27th.On 25th, 26th, 27th I tried contact Mr Deepak, Mr, dillip, Mr kirtti. may many more. No one gives any response no info about when & what action. Finally on 27th I was told that the problem with outdoor unit is not to be serviced, rather replacement is to be done. Now, Mr dillip said outdoor unit replacement, mr deepak said indoor-outdoor whole unit to be replaced. I mailed the bill of purchase to them immediately. No official response has come till now. I have mailed to concerned higher officers Mr Vishal Marar & Mr Sandeep Gupta but in vain. Only auto generated mail responses come saying sorry for inconvenience. Hitachi might be having many customer and loosing me won't effect it anything but I have only ONE AC and it needs to work immediately.The list of contact details whom I have pleaded for service are as follows:- Via Email-Mr Vishal Marar & Mr Sandeep Gupta & customer care email address Mr Deepak- [protected] Mr dillip-[protected], [protected] Mr Kirtti- [protected] Technician numbers- [protected], [protected], [protected], Other contacts-[protected], [protected] Customer care number[protected] The inconvenience caused is not for-granted. I have been forced to face mental, physical harassment. I want the unit to be replaced urgently within minimum time frame with no defaulter request. I also want to know what action has the management taken so that this does not get repeated to anyone else.