where can in get a camshaft for 2003 2.5 TDI T4?

My 2003 T4 2.5TDI overheated and I had the cylinder head done and replaced all gaskets but while starting for first time the camshaft broke. Now I need to replace the camshaft and have the cylinder head aligned or lined according to my mechanic. where can I get the camshaft here in South Africa