Amazon — Have not received my purchased product yet

Address: Pune, Maharashtra

I ordered a mobile phone from AMAZON on 11th May 2015. I have not received it yet, it was dispatched on 17 th May, and is currently with AMAZON TRANSPORT SERVICE, PUNE. The customer care representatives don't have any communication from transport services. I call amazon everyday to get the update on my product delivery, everyday they promise, i will get the product tomorrow. i would like sue this company, can anyone help me how can I do that? I have paid 9k to purchase this product. Either the delivery guy has kept my product with him and has gone absconding or amazon transport service of pune ( bawdhan - pashan) is too lazy to deliver it. Please help me how to sue them?