Please never share confidential information like OTP number/ login password when you receive any unsolicited calls/ SMS/ e-mail/ IVR with anyone as Sundaram Finance Limited or its employees will never ask these details. Click here for December 2025 Large Defaulters List.   Centralised calls with the prefix - 1600 - from our company are official and safe: 1600 53 1013 | 1600 11 3099 | 1600 522 225.