State Bank Of India [SBI] — I am complaining about mismatch in account balance

Address:

Cooch Behar, West Bengal, 736159

1) type of account : savings account
(2) account no. [protected]
(3) bank : sbi, tufanganj branch, dist. Coochbehar.
(4) name of account holder : santana ghosh (5) last transaction done on 01.10.2018 - rs. 15000
(6) book updated on 05.10.18
(7) two types of balances are there : normal bal. & mod bal. Normal bal. Is alright. Mod bal. Is rs. 15000/- which shd be 55, 000/-.
(8) letter sub. By santana ghosh on 29.09 18 to the bm for discontinuation of mod facility.
(9) mod bal. Was 55, 000/- on 25.09.18 after which rs. 15000/- was withdrawan on 01.10.18 and this 15000/- has been debited from normal balance.