Bad Service

I have send around 7 mails within a period of 15 days to cancel my tickets. When i got no response after 3 mails i called them to inform them to cancel my tickets. They said as my tickets are booked for December they will cancel it later as they have so much time left. Then again i send them reminders as they did not bother to reply to any of my mails. Finally when i called them today again to speak to the manager they refused to give me the details of the manager stating that they are looking into this matter. Its a pathetic experience trying to cancel my tickets and get refund from them. Can someone help me here?