State to us what the court orders of visitation are .
Let's drop the street lango .
IF you have court orders to pick up ,you go there to pick up ( in proper seat belts if by vehicle if of age ), leaving you GF waiting for you to return if possible .
If Mom states you are not taking the children for you court ordered visitations , call the police to the scene and have your court orders to show you were there ,and ask the officer to make a report to document your attempts to utilize your court ordered visitations , each and every time you are refused court ordered pick up.
If you are allowed phone conversation per court order and refused , document it .
Buy a note book ( like in school ) .Write down Dates and times of refusals .
After two or three refusals for pick up , file a modification citing the contempts .
You can ask for a change in custody and sanctions for the contempts , or if you do not want a chance at custody ,just file a contempt petition ,citing all contempts and ask for sanctions .
When dealing with Mom leave GF somewhere else ,even if it's down the road until transfers take place .