Child visitation

I got divorced in 2017 in Bangalore. I have custody of my kid (9yrs old now). As per court verdict, 1. My ex-husband is supposed to pay school fee. 2. He can pick-up my kid on Saturday 10:00 AM and bring him by Sunday 10:00 AM. 3. My kid can stay with my ex-husband for a week in summer holidays. But, he is not doing any of these things instead, calls my kid on weekends and force my kid to talk to him. His contribution for the kid is absolutely zero. He is failed to give any kind of support for the kid. I have taken sole responsibility of my kid from the birth to till now. I got married again in 2019 and I left my job in Bangalore and moved to Hyderabad. I am a home maker now. I have below queries. 1. What is the process to stop visitation? because, my ex-husband only interest is to disturb our personal life by calling at least 20-30 times on weekends. My kid is not at all interested to talk to him but, my ex-husband threats my kid saying I will bring police if you don't talk to me. He threatens me saying, you have taught him to behave in this way and threatens me with consequences. 2. Actually my kid is very much emotionally attached to my current husband. And my current husband only taking care of all of his needs. It could be emotionally or financially. Is there any way my current husband can become legal parent? 3. what is the process to change my kid's name?. My kid accepted my current husband as his father. He feels so much discomfort when his peers ask about "father name" which is present in his name. I strongly feel, my child doesn't have to go through the discomfort of carrying my ex-husband's name which he is facing on daily basis.