SSS — sneakers size

Address:	New Delhi, Delhi
Website:	www.sss.com

I ordered two pairs of sneakers from sss. They came after a month and what i received was not my size. Although 39 fits me well but the sneakers we're too big for me.
They aren't allowing me to get both changed.
The bill i received in my email said the amount was 994 but the invoice the delivery boy had asked me for 1093.
Please help!
The quality is really poor!
The products in the picture and the products in real appear to be different.