I ordered a slipper of ucb from amazon, and actually ordered wrong size.
I was searching for a contact support. And there I got an option to get an email or a phone call from that side , that was lovely : -)
I opted for that.i got the call instantly and the service support helped me very nicely and he actually told me about much discount.and I was so happy.after that purchase and I bought my router and a mobile phone too : -) Thank You Amazon : -)