It'll have gone massively downhill since it got took over by Crapita.
Fortunately I left just before that, in 2002.
But if you'd have got a letter through to me then you would have got good customer service. If you'd have written a good letter, and explained your case correctly, and had actually bothered to write properly, then you would have got what you deserved.
But, and I'm not saying this is the case with you, but the problem a lot of the time is that people's definition of 'customer service' is 'getting what I want'.
For instance one of the most popular thing I had to deal with is people wanting a refund for their coverplan (after sales warranty). A lot had a genuine story about how they'd no longer got the item and could they please have a pro-rata refund. Yes, no problem.
But a lot would get on the high horse from the word go, were 6 months in, and would launch into an epic diatribe about how they were 'mis-sold' it and wanted a full refund of everything they'd paid for it from day 1. No, sorry. They got politely told to bugger off.
I did also have sympathy with any tales of being messed around by engineers and would be fairly trigger-happy on the '£20 gesture of goodwill' button, and I would also be fairly good at spotting cases where somebody had something that had had to be repaired multiple times and would normally be fairly trigger-happy on the 'refund/replacement' button.