Pen Air Federal Credit Union Credit Cards

I have been using Pen Air for so many years. Never late always paid on time or before time. Well I recently had a baby and either the month I had her or the month after I was late in payment. I don't know how I missed it but I did and and there's nothing they can do to take the one late payment off. What's the point of even being a valued customer if they don't have great customer service? I will be canceling my credit card and closing my account with them. I know one late payment doesn't really hurt your credit but at the same time why use them if their not there for you in hard times. I didn't receive a phone call or nothing about my payment being late or anything.