Does your "pierce RUR 2500" have the Burny 10 controller or what???
Here in the USA we use programs like ProNEST, SigmaNest, FastCAM, NC Pyros. These programs will take your CAD geometry and convert to NC code.
Also keep in mind that no program can fix bad geometry... some listed above can have a tolerance set to close gaps or has a utility to remove duplicate geometry (lines over each other).
Hope this helps... James