Bangalore Development Authority [Bda] — wrong marking of the boundaries

B. S. Rajarajeswari
W/o prof. K. S. Nataraj,
"sukrutha", no. 1246,
2nd cross, 20th main,
Jp nagar, ii phase,
Bengalooru 560 078.

Dear sir,
Ref. : site no. 577, banashankari vi stage, i block, bangalore
Sub. : wrong marking of the boundaries of my site

I, b. S. Rajarajeswari, owner (Original allottee) of the above site wish to bring to your notice the following and seek your advice/guidance in this regard. I wanted to safeguard my site (Before taking up construction) by putting up a compound wall around. When our engineer approached the bda authorities at the bsk office, the concerned engineer deputed a person (Who had marked the boundaries of other sites in the area) to get the boundaries of my site marked. After that, i spent nearly rupees 200000/- to construct the compound wall.
After about a fortnight one mr. Mahesh (Phone:[protected] called on me and alleged that i had encroached into his site (No. 576, which he had purchased from some one else). Another person from bda who had accompanied him endorsed his view and advised us to sort it out between ourselves.
I want to know who is right and whose marking is authentic. How can i be sure that there'll be no problem in future.
Please guide me in this regard and oblige

Thanking you
Yours
B. S. Rajarajeswari
(Ph. : [protected])
13th september 2017