Applescript throws error when changing file name - file

Question

I am trying to create a generic temp .pdf and then change the file name of thetemp file to the specific file name in the same folder on an NAS drive using the code below.
I get error -10006 'can't change name of file...". Any help would be most appreciated.
tell application "Microsoft Excel"
save active workbook in ("Volumes:FrameNASfolder:12 PANDORA:Pandora PDFs:PDF
TempFolder:TempName.pdf") as PDF file format
end tell
tell application "Finder"
set name of "Volumes:FrameNASfolder:12 PANDORA:Pandora PDFs:PDF
TempFolder:TempName Invoice + Quotation Sheet.pdf" to "3999A Estimate TEST 14-07-20 16-32.pdf"
end tell
I can generate the temp file every time, but no joy with the name change.

Answer 1

First of all – even if the pseudo POSIX syntax works – HFS paths are supposed to start with a disk name, not with Users nor with Volumes.
As mentioned in the comments you are going to change the file name of a string which is pretty pointless. Add the keyword file, item or alias to create a file system reference
set tempFolderPath to "FrameNASfolder:12 PANDORA:Pandora PDFs:PDF TempFolder:"
tell application "Microsoft Excel"
save active workbook in (tempFolderPath & "TempName.pdf") as PDF file format
end tell
tell application "Finder"
set name of file (tempFolderPath & "TempName Invoice + Quotation Sheet.pdf") to "3999A Estimate TEST 14-07-20 16-32.pdf"
end tell