Switch statement outputs the case followed by the default

Question

I have the code below as part of a C program to change direction. Whenever I run the code, the output is always the case followed by the default. Why is this happening and how can I stop the default showing every time?

Thanks

Output Example:

Enter command: W

Sorry, You can't go that way. Please enter another direction: Sorry, that's not a direction. Please enter either N, E, S or W:

printf("\nEnter command:"); while (1) {
    scanf_s("%c", &ch);
    switch (ch)
    {
    case 'w':
    case 'W':
        printf("\nSorry, You can't go that way. Please enter another direction:");
        break;
    case 's':
    case 'S':
        printf("\nSorry, You can't go that way. Please enter another direction:");
        break;
    case 'e':
    case 'E':
        printf("\nSorry, You can't go that way. Please enter another direction:");
        break;
    case 'n':
    case 'N':
    case 'q':
    case 'Q':
        printf("Goodbye!\n");
        exit(0);
    default:
        printf("\nSorry, that's not a direction. Please enter either N, E, S or W:");
        break;
    }
}