Hi wmm ,
Sorry to hear you are having difficulties.
The issue with the CSV seems a problem with the format, you can read more about this here. Please, check it and tell me if this is your case.
Regarding the XML file issue, we haven't known of any incidence with it, so, to find out what's going wrong with the import in your site, we'll need you to send us the XML file and the template you're using (you can export it from the Templates page)
As these files may include sensitive info, please, open a private ticket here referencing this post and attach there the files in a zip file.
Best Regards,
José Andrés