Does mother text? and will she answer?
Text her in the morning that you will be expecting child at xx time at the house as court ordered. See if she responds. If she doesnt, when the time comes, text again "please let me know when you will be here as it is now 5:15pm".
If she does not text, call with same as above and leave message ...then you have phone records you were calling.
Next day file contempt of court. Child is court ordered to be brought to my home XXX. Mother did not bring child on XX date at XX time. Father tried to call mother and was denied his parenting time. Father asks court for sanction against mother as it seems fit, father's lawyer fees, and make-up time to be added to his time (can get specific as to when).
Do same thing next visit...
If she is supposed to come often then wait two weeks and do this for all the visits...then file and list all the dates and how many total days you lost of parenting time.
You can have a friend notarize a letter stating children were not at your house at the above date.
Contempt of court was a little different then reg family court date. They were strict with
BM and told her she needed to get lawyer as this was a serious charge (not much happens to moms but the judge will get sick of her if she continues and she wont like if she has to pay for your lawyer)
Did you try the "intent to visit" letter from this site? It is strong worded...might work and it will prove you told her that you wanted the time with the kids and to drop them off.
What is her reason for not bringing child?