HDFC Bank — undue forceful closure of debit card in lieu of credit card payment

I am SUJATA and had availed credit of Rs. 80000 for the EMI payment against Country Holiday Inn & Suites, for which the following EMI's were deducted automatically:
04-Nov-17 7220.66
03-Dec-17 7400.66
02-Jan-18 7372.49
05-Mar-18 8538.14
02-Apr-18 7343.61
03-May-18 7328.9
02-Jun-18 7314.01
after which one EMI was returned from my account however i had sufficient balance as per my knowledge as I had checked my saving account and it showed a balance of Rs. 11682/- but later the local branch confirmed that it is the cummulative amount of all my accounts and joint accounts shown on the main page .
This was discussed with HDFC customer care executive and they told me that I will not be levied any extra charges for the late payment and so after that I made manual payments as per below details:
17-Jul-18 7300
21-Aug-18 7, 300.00
and they are again called me for some Rs.1400 balance which I guess was again the penalty amount...they are charging me...
when i ask for clarification they go round and round about that some file is to be closed...
Along with the details as above 2 EMI's of Rs. 7300 was also made on 03.09.2018 & 04.10.2018.
Which means I have already made a payment of Rs.89101/- against my availed credit of Rs.80000/-.
But still again HDFC has sent me a notice regarding outstanding amount of Rs. 7721/- and threatened that they have blocked my debit card and will forcefully deduct the above amount from my saving account.