Was in Washington DC and took the DC Metro. – their name for the subway. The Metro has a rather lame card that can unexpectedly become demagnetized. When it does, it doesn’t work and you have to get it signed off on, in order to submit by mail for a refund. All rather cumbersome. While in DC two [2] cards I had went south and twice a station master had to sign the card and the amount used. Using their form I mailed in the cards and the amount owed; $10.40. I not only submitted the cards but did the math as well, on the form. Today a check arrived in the amount of $9.35. Stupefied, I telephoned the office to ask why the difference. No reasons, no answer, they will now send me an additional check for $1.05. Go figure.