Hmm you know guys why is this have a +12 ? Not showing a full text this is just a string in my PHP code. thanks a lot.
Finally found my answer here, just use DataType::TYPE_STRING, this now showing the data that I need.
use PhpOffice\PhpSpreadsheet\Cell\DataType;
$sheet->getCell("Y")->setValue($data["ref_num"])->setDataType(DataType::TYPE_STRING);