Android Content Provider Update not working

I have a code which updates a column called status but the update is not taking place.

Here's how I call the provider:

ContentValues values = new ContentValues(1);
                values.put(ChatDataProvider.COL_STATUS, 0);
                getContentResolver().update(Uri.withAppendedPath(ChatDataProvider.CONTENT_URI_MESSAGES, "lastcliq/" + userIdOther.toString()), values, null, null);     

And here's my update override:

    @Override
        public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
                SQLiteDatabase db = dbHelper.getWritableDatabase();
                int count = 0;
                switch(uriMatcher.match(uri)) {
                case MESSAGES_LAST_MSG_BY_ID:
                        count = db.update(TABLE_MESSAGES, values, COL_USER_ID_TO + " = ?", new String[]{uri.getLastPathSegment()});     
                        break;  
                default:
                        throw new IllegalArgumentException("Unsupported URI: " + uri);                  
                }
                getContext().getContentResolver().notifyChange(uri, null);
                return count;
        }

The weird thing is "db.update" returns a count of 2 which is correct but the values of COL_STATUS is not set to 0 as when I query again, the same rows still have status=1.

All other methods in my Content Provider perform as expected. Any help/thoughts will be appreciated. Thanks!