YOUR DEMANDS ARE UNREASONABLE
i think seller in your case case clearly said "return charges has to borne by buyer"
READ THEN BUY.
no seller will ever sell you anything intentionally wrong.
AFTER FEW DAYS YOU WILL BUY MOBILE FROM A STORE AND THEN WHEN YOU HAVE TO GO SERVICE CENTER IF MOBILE TROUBLES.
YOU WILL START ASKING FOR CAB,BUS,RICKSHAW FARE. ๐ฎ