simply changing
alias yum='yum --releasever=6.5' 
to
 alias yum='yum --releasever=6.4'

didn't work while testing and thrown errors like (this is  not exact log but error was like this with full urls)
 not found trying next mirror..again not found trying next mirror
 in console

So I changed according to 2Creatives 6.4.2 and it worked