Yellow coloured smelly water in borewell


My three year old borewell with 450 depth is now getting black and yellow colour, smelly water. Kindly guide me how we can fix this? I have no other source for water. Will bore cleaning help? Pls guide me (the neighbouring house 500 meter away from me is selling water but they never faced this kind of issue)

Thanks & regards

Vinod KS
Hebbal Bangalore
Phone: 9249511160