if you see sify's site, it will show you some unltd, night unltd & data transfer packs (at least for mumbai)however, if you go to sify's online renewal system, you will find packs which were discontinued 2-3 years ago still available for renewal.even i'm doing the same thing. i renew with the pack of 256 kbps 150 MB/day NU pack for 3 months which has been discontinued but still available thru the online renewal system 😗