Child Visitation In Barasat- Wife Not Allowing

Sir, I am from Barasat, West Bengal. My wife is not allowing me to meet my 5 year old child since last 3 months. Phone bhi block kar diya hai. I want to meet my child. If my wife agrees on call, I only need a written agreement on stamp paper. If she does not agree, I need to send a legal notice. Need a low-budget family lawyer from Barasat Court. Please call me, budget is low.