Voltas — Frauding the customer during installation

Address:

Voltas house A 5th floor Dr. Babasaheb Ambedkar road chincpokli mumbai 400033

My aur conditioner got installed in the month of 28th May, 2022 the guy from voltas have charged 8000 cash from me mentioning that you have to pay ...and went directly after taking the feedback as I was in the mid of my meetings with my client he refused to give me the bill which he have charged using the words like extra pipe and equipment got used...and now whenever I call he is not responding have complaint in service center but no response..request to remove such people's his name is ishtiyaq from lalbaug branch..i want justice in this