I deleted my (outdated) phone number from facebook years ago and it's still part of the leak, with my name and gender in it. I did not replace the phone number with another phone number. Really says something about what delete means for fb.
Since the storage of data is so cheap, any company will archive data, for future profit.
Why did you believe any data will be deleted in the first place? Were you counting that government will take action if it finds out? Are there any case like this in the past.
I find it surprising even programmers believe their data will be deleted by the company.
Most people even programmers believe a company will delete their data. Whats your background? Are you a coder?