Maximizing an Accommodation From Amazon

Speaking of Amazon, suppose you order a belt strap under Prime, you get no notice of its being out-of-stock and you realize 5 days later you won't get it for another 5 days. You do an email complaint to Amazon and they extend your Prime Membership by a month. You send them an email "thanking" them but explaining that does you very little good because you would have renewed anyhow. They send you a formalistic response thanking you for your feedback. You then send a stern email about how disappointed and shocked you are with this Amazon support experience given how good Amazon support generally is. You then will get a supervisor response giving you at least a $5 credit against future purchases, which means your belt strap cost got slashed by about 50%.