Consumer Redressal

Dear Sir/Madam, My Sony VAIO laptop had problem with sound (no sound), and some cosmetic issues (key missing etc.). I had submitted the laptop to Sony Service Center (Jaypee Electronics, Sector-2, Noida) on 4-Oct. I was called multiple times by the service center, but the laptop was not returned. After more than 1 month, I wrote to Sony India. Since then I have received two more complaint numbers (22725177 and 22374022) but nothing has happened. I have written mutiple mails which are not even responded by Sony. The laptop is within warranty and additionally I had taken insurance on the same. Now I need the laptop in full working condition or full refund. In addition, penalty be imposed on Sony and Jaypee Electronics, so that they do not harass their customers again.