Seeking Colombia municipality geometries

You can try the WFS or WMS servers of the Instituto Geográfico Agustín Codazzi (here:http://www.igac.gov.co/wps/portal/igac/raiz/iniciohome/MapasdeColombia/Descargas).

These services have different layers for geodesic features and demographics.

If that doesn't work, you can check this link with the shapefile I use for Colombian municipalities: https://www.dropbox.com/sh/i0ao837gj5wpkic/AAAnzZf-tJIKUmZvTKrvXPMpa?dl=0