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If you want to set a cell value by coordinates, for example setting text for cell A1, the correct way is to call this addCell method. This way the whole styles will be kept.

$xlsx = new CreateXlsxFromTemplate($filename);
$xlsx->addCell(array('text' => 'Inserted text'), 'A1', array(), array('useCellStyles' => true));

I think this is not a very reader friendly way to simply change a cell value.

You might wanna think about another method ('setCellValue' for example) which calls the above method and only requires a string and a coordinate parameter. This way the user code is way more readable.