Poor supplier loyalty to loyal customers

I am feeling soooo disgusted with Air France. Although I am not able to travel often, I have been loyal to them over the years. When we embarked on our recent trip to Scandinavia, I booked Air France/KLM. However, when it came to the online check in I struggled to get the system to recognize my membership number. I have just been informed by AF that it "expired" because I have not flown with them for more than 2 years. I received no correspondence whatsoever advising me of this. They all want customer loyalty, and I was loyal (note the past tense) but loyalty be damned from the supplier to the customer. It's a very shabby way of treating people and I will no longer be flying AF or KLM even if I have to pay more to use another carrier. Please note: this is NOT about the miles (I get that they expire) it's about AF recognising that we exist, and not "cancelling" their customers.