HDFC Bank — amount withheld for reason not known to bank personnel also

I hold a salary account with hdfc I also had a l loan for which I was paying an emi of Rs. 8697 due every 4th for the past 2 years. On 6th march, I opted for an instant top up to repay my credit card dues totally. The emi of the new loan being RS. 10843 starting from 7th April. After preclosing the old loan the remaining amount was credited to my account and I made payment to the card as well. Now the bank has withheld RS. 7563 for some 10 seconds loan. I don know what that is and neither does the bank personnel knows what it is. I am being directed from one team to another with no response. I have a medical emergency and it's very difficult to keep calling and begging for release of the funds. Kindly help me file a complaint or get the refund ASAP, .