Does subway lie to you about how many calories their food is?

My dad wanted me to feed my grandma at the hospital because he says the nurses don't bother to feed the patients and if you don't force feed her she will die so I asked him to give me $10 dollars to cover the cost of water and food while I'm at the hospital. I had a chicken sandwich from Subway and I remember that their sandwiches are around 1400 calories but when I looked at the website, they claim that their foot long is only 640 calories. I think they are LYING ABOUT THAT!!! that is IMPOSSIBLE!!!
Does subway lie to you about how many calories their food is?
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