This happenned some months ago, but I’m feeling whimsical enough to post it.
I usually listen to Classic FM. One day their adverts were being particularly annoying - especially, in fact, their adverts for their own products - and I found myself switching over (and then back later) quite often. So I emailed them to complain. Blow me if that afternoon I got an email back responding to my concerns in detail and the next day the adverts that had been so annoying were gone.