Task: Question Answering
Input (English): Context: Then a month or so later , they suddenly disconnected my server for nonpayment . When I called them up to see WTF was going on , they said my credit card did n't work . Turns out they had done some work in their accounting system , and my MasterCard got reclassified as a Visa . 
Question: What is the reason why my card did n't work ?
Output (English): Because it got changed to a different company .