Hi Sushubh,
Thanks for pointing out your concern on this matter and really sorry to bring you trouble.
We do understand the tradeoff here and we decided we really need to help our users pay for their Internet Subscription Online, when cash is in shortage.
Unfortunately it appears that all other channels of communication were not efficient enough, to point our users to my.excitel.com portal.
P.S. The javascript is safe. We have done all necessary checks to ensure that we do not compromise the security of our users. Thanks again!