El servicio de Android no se detiene después de cancelar

Tengo un widget que inicia 2 servicios usando AlaramManager y ejecutándolos repetidamente:

public static final String TAG = "RotterWidgetProvider";
public static ArrayList<SubjectObject> subjectsList;
public static boolean isUpdated=true;
public static int currentSubject=0;
private PendingIntent serviceShowNextSubject = null;  
private PendingIntent serviceDownloadSubjects = null;
Intent i=null;
Intent i2=null;

@Override
public void onUpdate(final Context context, final AppWidgetManager appWidgetManager,int[] appWidgetIds) 
{
  RemoteViews remoteView = new RemoteViews(context.getPackageName(), R.layout.rotter_appwidget_layout);
  Intent launchAppIntent = new Intent(context, WidgetSettings.class);
  PendingIntent launchAppPendingIntent = PendingIntent.getActivity(context,
           0, launchAppIntent, PendingIntent.FLAG_UPDATE_CURRENT);
     remoteView.setOnClickPendingIntent(R.id.imgWidgetSettings, launchAppPendingIntent);
  if(subjectsList==null)
  {
     remoteView.setTextViewText(R.id.txtSubject,"נא לחכות, טוען נתונים");
     ComponentName RotterListWidget = new ComponentName(context,
                RotterWidgetProvider.class);
        appWidgetManager.updateAppWidget(RotterListWidget, remoteView);

       final AlarmManager m = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);  

        final Calendar TIME = Calendar.getInstance();  
        TIME.set(Calendar.MINUTE, 0);  
        TIME.set(Calendar.SECOND, 0);  
        TIME.set(Calendar.MILLISECOND, 0);  

        if(i==null)
        {
           i = new Intent(context, UpdateRotterWidgetService.class); 
           Log.v(TAG,"UpdateRotterWidgetService Created");
        }
        if(i2==null)
        {
           i2 = new Intent(context, DownloadSubjectsService.class); 
           Log.v(TAG,"DownloadSubjectsService Created");
        }

        if (serviceShowNextSubject == null)  
        {  
           serviceShowNextSubject = PendingIntent.getService(context, 0, i, PendingIntent.FLAG_CANCEL_CURRENT); 
           Log.v(TAG,"serviceShowNextSubject initialized");
        }  
        if(serviceDownloadSubjects==null)
        {
           serviceDownloadSubjects=PendingIntent.getService(context, 0, i2, PendingIntent.FLAG_CANCEL_CURRENT); 
           Log.v(TAG,"serviceDownloadSubjects initialized");
        }

        SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(context.getApplicationContext());
        String subjectsDownloadInterval=settings.getString("SubjectsDownloadInterval", "10");
        String subjectsUpdateInterval=settings.getString("SubjectsUpdateInterval", "10");
        int down=10;
        int upd=10;
        try
        {
           down=Integer.parseInt(subjectsDownloadInterval);
           upd=Integer.parseInt(subjectsUpdateInterval);
        }
        catch(Exception e)
        {

        }
        m.setRepeating(AlarmManager.RTC, TIME.getTime().getTime(), 1000 * 60*down, serviceDownloadSubjects);
        m.setRepeating(AlarmManager.RTC, TIME.getTime().getTime(), 1000 * upd, serviceShowNextSubject); 


  }
}

Después de eliminar el Widget de la pantalla, cancelo los servicios:

@Override  
public void onDisabled(Context context)  
{  
    final AlarmManager m = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);  
    m.cancel(serviceShowNextSubject);  
    m.cancel(serviceDownloadSubjects); 


} 

Pero los servicios no se cancelan y siguen ejecutándose en segundo plano. ¿Cual puede ser el problema?