Getting wrong file size everytime with winrar and 7-zip

Hey, I'm trying to extract a big file from .zip.000 files and every time I'm getting wrong file size i.e., not getting the full extracted data.

There are 134 .zip.000 files so that's file.zip.001 - file.zip.134.

Each file size is 500 MB so that's 500x134 = 67000 MB. Now I extracted the first file using 7-zip and it took around 30 mins or so and got 32 GB of extracted data only. Then tried WinRar and got 6 GB of extracted data. And no I am not getting any error during the extraction.

Any idea whats going on and how to solve?

Try downloading the file again. Check the MD5 hash/checksum to make sure it is complete and not corrupted.
https://www.google.com/search?q=md5+checksum