in the first post you show the point file format as ENZ. This is not correct, it should be PENZD comma delimited. A csv is indeed comma delimited, so you should be good there. Make sure that the point inmport format is looking for a csv. Ours is set up to look for a txt, so you may have to edit the format or the point file extension.
If you have set the correct format in C3D and it still won't import then the problem almost certainly is with the point file. Open it in Notepad - NOT Excel. It should not be space or tab delimited. If it is search and replace with commas, or choose the correct format in C3D.
C3D does not allow alpha numeric point numbering, so make sure the points are numbers only. The point number does not matter (you don't have to start with No. 1), unless there are duplicates (you would be asked what to do in that case in C3D during the import process).
If you use a PENZD comma delimited format, and your point file is Point Number,East,North,Elev,Desc, with no headers, no extra lines, no nothing but comma delimited point data beginning on line 1, as seen in NOTEPAD, it should work.