Termites?

Is there anyone who can advise regarding what appears to be termites eating away at our wardrobe frame in just one of the bedrooms in our underbuild.
We had same problem approx 2 year's ago when the frame was sprayed and the infected area cut out and replaced with new. The underbuild is used as family accommodation during summer and we use upstairs as our holiday home therefore it was a little difficult to spot.
It seems to have come back with a vengeance on the cross member supporting the shelf and the top corner of the frame.
Should we call pests r us to determine problem.
Any advice or recommendation would be appreciated.

I would think calling someone in is a good idea as you dont want it spreading elsewhere.
Its the joys of livingin the sun.