Samsung — Complain about after sales service and also took money

Sir,
I have ac of made year 2015, and I booked request for its service and after 2-3days the person came and told during the service that ur ac some of the internal part is to be changed, so we agreed and after that when that particular part arrived it was damaged so I refused for it, he told sorry and again book for the same then again the part came and it was different part of different model..
So he again booked same and then he went after that day no msg from samsung Or no msg or call from that person he also took 650+550 from us and told I will come back keeping my unit lying down on the floor, but 3months have been passed but no response from the mechanic or from samsung.