Some issues, plus a glitch on this recent update

Firstly, a reviewer mentioned about the fact that a person not registered in your contact has the full name appearing only on the lock screen, YES, this is true! Why doesnt the name appear when you look at the persons info?

Second, on this update there seems to be a glitch with voice messages. If I sent a voice message that was 3:29 long, and then I send another one to the same person that was 0:07 long, it appears as if the voice message is the same length as the longest one I sent that day, which would be 3:29. How does this affect data usage??

Third, there must be a way to send messages to someone without having to add the number into my phones contact list. Im looking for an apartment and theyre all reachable through WhatsApp, but why would I need their number on a long term basis?? Its just cluttering up my phone with numbers I wont use ever again.

ISM PLUS about WhatsApp Messenger, v2.17.42