HDFC Bank — Hdfc jumbo loan

Address:	Ernakulam, Kerala, 682017
Website:	hdfcbank.com

I've took hdfc jumbo loan against credit card 2 years before. The amount is 70, 000. Its 36 month tenure, and monthly payment is 2320. I was paying it properly last 2 years. Last month my account balance went down and autopay did not debited the amount (23/may/2016). The bank charged me as following

Payment return fee : 450.00
Autopay returned : 2, 320.99
Autopay thank you : 2, 320.99
Late fee : 500.00
Service tax : 63.00
Jumboloan, int nbr:20, [protected]: 357.90
Jumboloan, prin nb:20, [protected]: 1, 963.09
Cess tax : 2.25

Total : 5, 657.23

Due date 23/jun/2016

2 week before an hdfc representative called for not paying the amount. He told me to pay amount as soon as possible and i said will pay on 3 days after that day. After some time i received call from them regarding same, and it repeated, i cut the subsequent call from them. The next day at 10am i start receiving calls from them, i cut the call and i received approximately 50 call from them that day. Next day about 77 calls. I've amount at my hand but i still not payed the amount, i will be paying on 23/jun/2016 only. From that day to today i've received over 750 call from hdfc bank. They are speaking in a manner that "you should pay some how today, other wise we will continue calling" in small threatening manner but not with the words, in safe language to indicate they are not threatning. When i try to tell something he just keep telling "you should pay some how today" again and again and again.
I receiving calls from following numbers only few listed.
+[protected]
+[protected]
+[protected]
And similar so many numbers. It ring continuously one after another with new phone number using some automated system. Now i'm handling this call using auto reject call feature on my phone. But they call my home landline line number and telling my family that i was not picking the call. Just a second after making one call they call again like nothing happened before. Today i took the call in my phone to tell don't call at home, but no one speaking to me thinking i wont take call as usual. Just after that they called my home telling i didn't picked the call. If i would answer their call i need to sit all day for them. They are doing intentionally just want to irritate us to make payment. I never knew about this kind of new generation banking going around us, before paying the amount i would like to know whats going on since i've a revised fine+return amount with due date on 23/jun/2016.