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