So why not do it all with the ZIP, like:
set SSIS_FTPFILE_ORG=I:\Information Technology\Retail\Durga\OsPos\Store Files\
set SSIS_FTPFILE_DEST=I:\Information Technology\Retail\Durga\OsPos
set LOGFILE=%SSIS_FTPFILE_DEST%zbatlog%curdate%.txt
"C:\Program Files\7-zip\7z.exe" a "%SSIS_FTPFILE_DEST%\ProductCatalog\ProductCatalog.zip" "%SSIS_FTPFILE_ORG%\ProductCatalog.csv" >>"%LOGFILE%"
"C:\Program Files\7-zip\7z.exe" a "%SSIS_FTPFILE_DEST%\PluSales\PluSales.zip" "%SSIS_FTPFILE_ORG%\PluSales.csv" >>"%LOGFILE%"
~bp