SAMLIKS

i am supposed to write a card counting function that It will receive a card parameter, which can be a number or a string, and increment or decrement the global count variable according to the card's value (see table). The function will then return a string with the current count and the string Bet if the count is positive, or Hold if the count is zero or negative. The current count and the player's decision (Bet or Hold) should be separated by a single space.

but the code doesn't seem to run,am being told that this must be done:

Cards Sequence 2, 3, 4, 5, 6 should return 5 Bet
Cards Sequence 7, 8, 9 should return 0 Hold
Cards Sequence 10, J, Q, K, A should return -5 Hold
Cards Sequence 3, 7, Q, 8, A should return -1 Hold
Cards Sequence 2, J, 9, 2, 7 should return 1 Bet
Cards Sequence 2, 2, 10 should return 1 Bet
Cards Sequence 3, 2, A, 10, K should return -1 Hold

What I have tried:
 

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var count = 0;

function cc(card) {
  // Only change code below this line
  switch(card){
    case 2:
    case 3:
    case 4:
    case 5:
    case 6:
    count += 1;
    break; 
    case 7:
    case 8:
    case 9:
    count += 0;
    break;
    case 10:
    case "J":
    case "Q":
    case "K":
    case "A":
    count -= 1;
    break;
  }
  
  return count + (count == 0 ? "5 Bet": "Hold");

please can anyone help with the solution.