harressment calls from hdfc

hdfc bank calls my wife and also the organisation she works with, on thier landline phones and asks for my credit card dues they are using wrong language with all of them and have insulted us in front of all in my wife company where she works, how a bank or collection agency calls others n asks for my dues and r giving us embrassing feeling in front of the company people where my wife is working they called randomly on all numbers of the organisation and disclosed with all of them abt my dues where my wife works that to in harsh language the mo .no from the calls came is 7506186056