CSR annual fee posted. Called a few days later and was offered a $150 statement credit to keep the card. Accepted offer (figured for $100 out of pocket after the travel credit it was worth keeping around).

Have had it open for ~4 years, used to put most of my spending on Chase cards but recently shifted pretty much all of it to Amex so relatively low spend on my CSR in the last year. Have called about a retention offer for my CSR pretty much every year and 1st time getting one. Yay!