Every time I contact American Express - their white glove service is evident in every call, letter, and communication. I have been a member since 1995 and now my kids are members as a result of my advocacy.
Companies I have experienced a negative service are ones that are usually one off sales, but then have a tag along aftercare requirement/option, buying a car or a boat would be an example. The sales process is rarely in my best interests, yet the aftercare team is super helpful fire fighting the earlier negative experience. Car dealerships are probably one of the most siloed departmental organizations I’ve seen and with a few exceptions, from start to finish - its more negative than positive experience.