State Bank Of India [SBI] — wrong deduction of rs 1200 in my rd account

Address: Bikaner, Rajasthan

I have open a rd account of rs 10000 per month for the period of one year in housing board branch bikaner rajasthan
My rd account no is [protected]. At maturity rs 4789 was credited as interest but on same day rs 1200 is deducted from my account and mention dcomm pr dr adj.
Please clarify that in which head this amount of rs 1200 was deducted since there is no valid reason to deduct the amont so please creadit this amount in my saving account no [protected].
Application regarding this matter is already submitted to the branch manager sbi housing board bikaner
Thanx