Consumer Redressal

I have purchased Voltas inverter AC model number 1.5TVOLTAS SAC18VDY around 3 months back fand since then I am facing an issue which is not getting resolved.Its been nightmare for me. I have done the biggest mistake to buy voltas ac. The problem is that 'F8' error gets displayed and ac stops working. 3-4 times their poor skilled technicians visit at my place and could not solve it and giving different excuses.Few of them are Ansari , Bajinder etc. One of their service agency head Mr. Brij Thakur is also not able to solve it.One technician says its indoor unit problem other says its outdoor unit problem. Brij Thakur ask them to take the PCB out and bring to the service center, other says that it can be solved there itself. Within 3 months , it my 4th complaint. Another point is that my complaint number is 15070401771, which was closed on 5 August 2015 , though none of their technician visited my place since last 2-3 weeks. I don't know how that complaint was closed. and who closed i