@Sidharth P Means there are too many subs they have gained in less time that their infra is not able to handle such network?
Likely the issue and the fact that they doubled their speeds without giving a thought about the capabilities of their network. Maybe this is a LCO specific issue. My LCO probably has too many users sharing a connection at once.
@Sushubh How are the speeds when a Mumbai or Kolkata server is selected?