Dish newtwork How did they get my new dept card number Internet

2 months ago we got dish ,,started noticing add on charges ,,,I wa ssupposed to pay only $55 a month first month was 55 next month is went to $65 ,so i deside I was going to switch over to charter ,they said they would give me a buy out when i get that bill from dish ,,,just so dish could not get my money i canceled my dept card and got me a new one  this month dish was emailing me saying they could not get my payment ,today 2-17-2016 i looked a my bank account those dish people got this months payment but how they did not have my new card number and i only had it a week ,I called dish they told me i went on line and but my number in { wrong} they said it wa sthe same card i used back in dec ,,uh no that was a different number she but me on hold 10 min came back and said i went on line and put in my new card number ,,how did they get my new number the bank did not give it to them i called my bank ,so now again i cancele dmy card again ,,i will nt get another one i will just use my husbands  card ,,,,,I went on dish and sure enough  it was there but howwwwww.....???? Now i am with out that money and i can not afford a lawyer