Let’s evaluate the above statements:

1. Amarkantak Hill:
   • Recognized as a significant natural heritage site.
   • Serves as the junction of the Vindhya and Satpura Ranges.
   • Therefore, statement 1 is INCORRECT.
2. Biligirirangan Hills:
   • Located in the southeastern region of Karnataka.
   • The Satpura Range, in contrast, begins in eastern Gujarat and extends eastward, bordering Maharashtra and Madhya Pradesh, ultimately reaching Chhattisgarh.
   • Hence, statement 2 is INCORRECT.
3. Seshachalam Hills:
   • Part of the Eastern Ghats in southern Andhra Pradesh.
   • The Western Ghats, however, span across several states including Kerala, Tamil Nadu, Karnataka, Goa, Maharashtra, and Gujarat.
   • Thus, statement 3 is INCORRECT.

Therefore, the correct answer is None.