Amazon as a business, are way beyond and up the ladder when it comes to customer service. if bill gates favors eradicating world issues, i can guarantee amazon will treat you with a service up and above beyond, but sometimes somethings are out of amazons reach, like warranties that apply to america and canada only.
Look for companies that support global warranties like asus, evga graphics cards, ect.
Don't buy of amazon unless you've researched the company and the item your interested in purchasing, always buy from prime amazon. you'll see it here:
http://www.amazon.com/s/ref=nb_sb_ss_i_1_7?url=search-alias%3Daps&field-keywords=gtx%20780%20ti&sprefix=gtx+780%2Caps%2C351
You have 30 days return, exchange on amazon prime orders and they'll reinburse you the costs, no maybe it's definitely refund you.
I purchase of amazon frequently, but be cautious, not with amazon but with companies that honor global warranties.
Additional stuff--
Do not use uk-usa exchange transfer when buying finalising orders at the chick out, conversion rates will commence.
If this shoe costs 60 us dollars, and you decide to pay in that amount, your bank will issue a conversion fee from your local currency to american; united kingdom currency.
The only way to purchase it in american dollars cheaper, is if your currency's greater then the american dollar.
www.amzon.com much better, then www.amazon.in. they can determine your orders and as in amazon india. it's essentially the same thing but prime global operates in the united states, and branches out.