This is a tricky one, but my logic goes this way.
The OC is required to repair and maintain common property.
Termites always enter buildings through subterranean passages.
The underground is common property ( lot property is the cubic space above ground).
It can be argued ths it’s OC responsibility to maintain and repair the underground, and that damage to the skirting boards was not due to you.
I think you may have an insureable claim, so make a claim on the OC insurance ( you don’t need committee or strata manager to do this ).
If the insurer denies the claim, it will be likely thsy claim lack of maintenance, which bounces it back into the OC court.
Dont expect anyone to take responsibility for this.