Smartphone Questions? Ask A Smartphone Technician for Answers
Hi there and welcome
If you never made a back up then for voice memos its not going to be possible sorry due to the way they are stored.
There are a lot of recovery programs which can work with text messages, photos ect, but not for voice memos, its why it only shows 0 as it needs to recover these from a backup, its the only way.
I know this is probably not what you wish to hear, but I can only tell you the reality of the situation sorry.