HDFC Bank — False information given by hdfc customer care executives

Address:	500081
Website:	HDFC Bank Customer Care

I've raised a closure request for jumbo loan which i've taken on my credit card. Customer care executive informed i can pay it in 2 ways which are netbanking and through hdfc branch. Unfortunately, i lost my credentials and cannot retrieve them as i don't have the registered mobile number. Again i called customer care to check if i can pay it from other bank netbanking. One executive said yes we can pay from other banks netbanking and one more said i cannot do that. He informed i can go to nearest bank and pay it by cash.
One of the branches they said they don't accept jumbo closure. Again i called and checked with customer care, can it be done or not by paying cash in bank and the answer from executive is yes. I wasted one more half day going to bank and again the same response saying its not a valid account number. I'm totally pissed off. And finally, now one more executive game me information that it can be done only through cheque and not by cash.
Are the customer care executives trained or not? Don't they have proper information about the products? If not, why are they placed there to answer customer queries? It's really creating more problem than helping customers in resolving the issue.