Can I withhold child support if I’m not seeing my children?

My wife and I are living apart and I am paying her child support for my children. We agreed I would see them each weekend from Friday through Sunday but she is refusing me access to them. Her refusal is unjustified as I love my children and would not harm them. I have been paying her regular support for the children since the separation. I want to know if I can stop paying that support until she allows us to return to the normal visitation schedule? Stopping the support may be the only way I can force her to allow me to continue my relationship with the children. Is there anything legally she can do to me if I withhold the support? I need to discuss this with a lawyer and I would prefer to work with a Muslim lawyer who speaks Hindi.