As far as I know it can be done only in person. or else contact their official phone number.
GTA Kolkata Gorkha Bhavan, Salt Lake (GTA Lodge Booking & Info) No. DD28, Sector 1, Salt Lake City, Kolkata – 700064 Gorkha Bhavan is located opposite the City Center Mall. Mobile: (+91) 99031 74047, Landline: 033 – 23377534 Call up to check with them about other alternatives.
Pl. booking for 5 persons at Trekkers Hut in Tumling, Manubhanj,Phalut & Sandakphu are as follows:
1. 05/03/2023 in Manebhanj
2. 06/03/2023 in phalut
3. 07/03/2023 in sandakphu
4. 08/03/2023 in Tumling
Pl. give us your bank details with IFSC code accordingly.
my whatsapp no. 6291401843