Refund of booking amount

Yes That is the only Choice. U R not only entitled for interest but damage also. It is a fit case for the Consumer forum.

First issue notice to the vendor.  If there is no response, file consumer case, where you can claim interest and puniitive damages from the vendor.  

Thank you so much Sir for your valuable suggestion. Kindly let me know if there is any waiting period for the same. As the vendor is telling that he will refund the same by the end of November 13. Should I wait till November 13 and take action after seeing the consequences ? Please suggest.

Yes you can wait but ask him to give the same in writing on white paper.  In the alternative, ask him to reply to your legal notice.  Otherwise, you will lose the limitation period to file consumer case.