Bajaj Finserv — I paid all emi

They consistently calling me every second and talking to me so misbehaving and even I told them I paid all my emi in one shot and I won’t pay my cheques bounce charge because I already paid what I own from them but continue they putting cheque to my account and it get bounce because I don’t use my account anymore . You can see I paid all my bills and emi and they even destroyed my civil score and I am so frustrated now . I am a liver transplant patient I donate my liver to my father go through a lot . But still they mentally disturbed me so much . They send people to my house they talk so rude . They even block my emi card but I paid all money what I own from emi card . Please help me