Misbehave with parents and break the rules of RBI

I am the very good customer of HDB since a year but somehow my one EMI gets bounce because of some technical issues after that I was getting many calls from hdb financial services but they are unable to resolve my problem … One day a employe of HDB employe called me from his personal number and started misbehaving me I told him not to cross the lines of rules and regulations of RBI and Indian laws he started abusing and shouting on call but I didn’t responded him and entertained hum well but next day he came to my residence address without informing me and without giving me any visit notice and I was not at home at that time because I am very busy in my business these days suddenly my phone rang and my father told me that one person came to our house gate and started shouting and abusing just because I didn’t paid one EMI due by 21 days I called him and told her not to do unlawful activities infront my gate but he ignored everything and started his misbehaving he told us that he will come again with some more HDB employes ..
My family is in shocked right now please reached us out sir/mam