Divorce Support Forums: "Bad Dad"

I have a situation and I am not sure what to do, and wanting advice. Here goes....My x pays his child support threw the child support system, so he is not late however; Our parenting plan states that he will get our son twice a week and every other weekend. Well he does not keep him he takes him to his parents house (grandparents) thru the week and every Saturday night. He never helps pay with any extra activities, I tried to be nice threw divorce (CRAZY) but I agreed to every other year on tax's. I have made dentist, doctor's appointments on the days that he has him to help me take him to the appoinments, and he constantly sends me threatening text messages and ends up canceling the appointment, plus he is moving in with his girlfriend which states in the parenting plan that this is a no no. Also he is paying me an extra $12.00 a wk for day care, he originally suppose to pay the entire amount but I agreed to let him pay me the $12.00 a wk and he said he would pay for any additional cost, guess what he didnt pay the extra so I took him out of day care, and i have found someone that picks him up and i give them the $12.00 to that person Am i in the wrong there? He constantly threats about the $12.00 a wk. You know its just $12.00.
Another question, can I or should I take him back to court gettting complete custody and him not get the tax break every other year and making him pay for the expense. Do I have a good chance on making this happen?

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