Sony India — Misbehave of the technician Mr Gurcharan Singh and he ruined my sony speaker

My complain number is 63637124 i have registered this complain on 23rd October for my sony party speaker model number: MHC V 72D it was working fine just want a nut bolt to fix it Mr Gurcharan Singh from Naraina service center visited he was rude and without doing any thing asked me to pay 6000 when we asked him the reason he said if you want this to get repair do let me know else i am leaving and then he left and i dont know what he did because once he left i turned on my speaker there was no power and i called him atleast 20 times but he never responded then i called service center Sony Authorized Service Center Star Electronics from where he came they said they will get back to me but no response received and then i called sony on their no to complain and they said they will escalate this which is still pending because of that technician my speaker is not even turning on now.