Some Updates about this Issue:
1. It's the first time that speeds are shit in the mid-night also. Most of the time (almost daily) speeds get normal in the night by 12:30 AM. But it's already 1 AM now and speeds are still shit.
2. Speeds to peered, non-peered, Indian Servers, Non Indian Servers all of them have shit speeds.
3. Additionally, Ping is risen a bit and Packet Loss is huge.
4. I am suspecting that they 'might' be over-selling the connections now or something is broken at their backend since it's not me who is alone, a lot of people on this forum and other websites/groups are facing the same issues.
5. This issue has nothing to do with the LCO. So, If Excitel ask for the engg. visit? It's total waste of time. It's the issue with their backend.
Most Probably, their transit routes or peering routes. It's quite possible that they have bad gateways /
routers at their Nehru Palace Office.
6. Companies similar setup as Excitel are facing more or less the same issues. To name one, Precious Netcom. (I feel Precious Netcom is sister / re-selling / dependent / re-branded Excitel only since at one of the gateway, Precious netcom route to Excitel's Gateway without any external routing (like A-->B without linking to any of the peering).