State Bank Of India [SBI] — Huge discrepancies in the way SBI maxgain loan works

Hi,

I took SBI max loan to construct house in 2018 and have been paying EMI (35k) every month without miss. I have noticed that small portion of money was getting vanished from my account. To prove my point, I removed all my money from my OD account few months back. Last month EMI was deducted from my SB account as usual, 30761 was interest and 4966 was principle. But nothing ( I mean total limit or availed amount) changed. Principle of 4966 just vanished, I don't know what happened. Today I transferred 228300 to OD account, but I could only see 220300/- account. What happened to remaining 8000/- SBI only knows. Few months back I spoke to someone in RACPC regarding similar irregularities, but they are confused and they dont know anything max gain.
I dont know how much money has been siphoned out of my account in the past 5 years. I need your help in solving this mystery.

Sandeep