www.Timtara.com / Sony Bravia Television — delay in shipment and no response on calling

My name is K.Kiran Kumar.
I have booked a Sony Bravia KLV-22CX320 22" HD LCD TV on www.timtara.com through online shopping paying Rs. 12,800 /- on[protected].
My order id is 10204181.
I was mentioned the product will be delivered within 10-15 days.
The next day they called me and asked me to submit the id proof so i did..
Now when i call them on the phone nos. given in the site, they are not at all responding,
when i sent a mail, they replied they are going to ship it on[protected].
And yesterday when they responded to the call they said the product has already been dispatched.
Today again they have sent a mail stating the product will be dispatched in the next 6-7 days.
And now when i have sent a mail requesting to cancel the order and refund the total amount ( as the product is not yet shipped), they are not responding.

My contact no. is [protected]