[MovedGoalPosts]

It is not that "fixable" with filler. If it is structural rather than decorative a fair bit of the timber section on the cross member has been broken away. Whilst timber components are often oversized, filler will not usually have a structural strength unless specialist resin bonding based systems are used. Equally whilst the timber was whole it would likely perform, and decay evenly. Where it is now chopped into, if filled especially with standard fillers, there will be a weakness where future decay is most likely to start.

I'd be wanting a completely new bracket to be made up.

Of course to deal with the bracket the cable needs to be moved, which no doubt means the installer returning to the property and some internal making good too.