Dell India — Late delivery

Address:

Sriperumbudur, tamilnadu

I've ordered a dell laptop on 14 july and paid full amount when they said it will be delivered on 25july.
Now it's 29 july and they are not responding in any way either email or phone call they keep us waiting on the ivr line for 1 hr and then they lift the call and disconnect it.
I tried to cancel the order and they say cancel is unavailable
I tried to see weather my location is not available for delivering it on their website, it's available for delivery and i'm receiving products from amazon, flipkart but not this one it's been 20 days please do something on this issue