Without knowing more I would say that attending a game that happens to fall on the other parent's weekend does not qualify as a day of visitation against you. If you take your child to practice/game and he shows up it shouldn't count as a day against him either. Sounds like you may want to talk with a family law attorney who can examine your Order and determine if there is a violation of the Order and they can help file a Rule To Show Cause.
The answer really depends on the language of your order. Sometimes, the family court frowns upon one parent signing a child up for activities that conflict with the other parent's time. If you are showing up on days to watch that are not your days, then the answer is no - you are not using up your visitation time. As to the phone calls, that too depends on your order. Having said all that, you may be able to take the matter back to family court to alter your order to address these issues/conflicts, to revisit the parenting schedule, and to provide for a telephone schedule too.
I have attached a link for you to download my free book on divorce and family law in South Carolina. I think it will give you some insight on the issues you are facing with the other parent.
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