There is nothing we ban do to help: ExportPDF is a server based solution, which means only Adobe had access to what's going on while your job is being processed. You are paying for your subscription, so I would assume that you are eligible for Adobe's service. Try again and see if you can talk/chat with somebody else who is more willing to help.
What I can tell you is that the outcome of a conversion from PDF to any other format depend highly on the quality is your PDF. If important information is missing from the input file, you will never get a good output file. When you have access to Adobe Acrobat, you can try to convert the file to images, then import these images again into a PDF file, OCR this file and then convert to e.g. excel. This sometimes does give you better results.
Please split the document into two parts and then try exporting the output PDF's into word.
How do you split the document with Export PDF ?
I know this. The OP has only Export PDF.
If it happens only with some specific file, Please share the file for digging down the issue.
-Thanks and Regards
I demanded that I need technical services, so they connected me to one. This one was very helpful, offered to install trial version Acrobat Pro DC, took her almost 4 hours (imagine I do it), I found the split file function, split it into 2 files, first one with 1200 pages, next with 1109 pages (25mb). then the 1200 to two 150 pages (6-9mb), 300 pages (8mb), and 600 pages (15mb). Exported each to Excel individually, all converted.
But there are big problems: the first page has only the last few lines, remaining pages all missing 14 lines. With 2309 pages, manual correction is out of the question. Anyone has any idea what I should do next?
Can cut and paste from Acrobat Pro over hundred/thousand pages an alternative? I'm OK with Access VBA to decode them.