You could ask the cops to do a welfare check. If you really really have concerns, not for the whereabouts but for their wellbeing, then this is an option. But it won't help... They will find the ex and let you know both ex and child are ok, but nothing else.
Go see your solicitor ASAP.
So a few questions - What sort of access do the court orders provide? How old are the court orders?
Don't continue to call her. You could be accused of harassment... A text message letting her know that you believe she has not complied with the orders and requesting some communication from her about the orders is a good idea - but don't harass. That means don't keep calling / texting and don't leave any threatening voice messages
Mate try and stay calm, but get to your solicitor ASAP