Repairs by the complaints process

Back on this again. BW don't seem to learn from previous complaints: one broken diffuser on a mains power bollard:

Note the missing corner at the on the bottom left.

• Point it out to at the annual electrical safety inspection: the engineer agrees it needs replacing.
• Wait all Summer nothing happens. 
• Point it out a second time to another engineer inspecting the electrics, he agrees it should be fixed and will tell BW. 
• Nothing happens
• Phone BW up to report this and another repair. 
• The other repair is done but no response on this one.
• Thinks, I am paying BW nearly £5000 a year for this mooring. 
• Start Stage One Complaint.

I will let you know what happens!