Samsung — AC

I got call from Samsung service boy for AC servicing.He is the same guy who did first time my AC installation.He came to my home and told that some part is not working. He took away that part from my AC. I am calling him from past two weeks. He is not picking call. Many times I checked he is busy on some other call.When I checked from Samsung customer care he told we didn't raise and send any AC servicing to your home. I have phone number of that boy. Please help me.