Samsung AFTER SALES SERVICE PATHETIC!

I've had my Samsung AC for just over a year now and since I've purchased my unit, it has given me endless problems. Two days after Dynamic Airconditioning installed the AC, this nightmare has begun. The AC works intermittently. It cools when it wants to and heats the room when it wants to. During the HEATWAVE that we had as well as this current HEAT, it's not cooling whatsoever. I've spoken to Gustav at Fourways AC. He said he would assist me, and I still await his call. It has been 3 months now. I've called Louw, the owner at Dynamic AC and he was rather RUDE and abrupt with me on the phone saying that there is nothing wrong with the UNIT. I'm so frustrated. I've spent a lot on this Interver UNIT that DOES NOT WORK! I regret purchasing this UNIT. It hasn't work for most of the time that I have it. PLEASE ASSIST ME, SAMSUNG! The service is RIDICULOUS! I'm a furious... sigh