Airtel — call from unknown number about installation of airtel 4g tower

Respected sir/mam I am Tanka Mani Chettri humble resistance of kalimpong, west Bengal, on 8/5/18 I got call from unknow number and when I received that call he told me that he is A.Sing from Kolkata and he told me to install aitel 4g tower.first he told me that he will give me 15lakhs as soon as the works begins and rs 15000 monthly.later he told me send Id proof and documents of land in his what'sapp number .so can you please help me to decide what should I do .is it fake or it's true?