Makro does not care about the service they render

I bought a Samsung aircon in late Nov. during the 10% eveing from Makro. No one advised me about the process that an accredited installer must be used otherwise warranty would not stand. Today I query as I was told about it and spoke to Strini who acknowledges that it is Makro error in not advising and says he will refund me for the product. He is not being reasonable as one cannot uninstall an aircon. If you are renting a property you would have to leave the aircon when you move. He refuses to pay call out fee for an accredited person to sort the error out. When I ask him to get the national service director to contact me say he does not know and I am must phone myself. Not willing to assist. When I said I am going to complain he say go ahead. His attitude is disgusting.