poor service feedback

I received a letter from Mitsubishi south Africa about a recall to my specific year and model Mitsubishi lancer for a replacement of the \v "belt. Mitsubishi Germiston is my closest dealer and workshop. i phoned and gave a lady by the name of sphiwe all my vehicles details and she promised to phone me back asap. after three days i still haven't received any calls and phoned her back. her response was that she's busy and she'll get back to me. its now been more than three weeks. the dealerships phone just rings and no answer"