When you start record someones voice, you have to inform them you are recording the conversation and if they agree to it, ask them to state their identity and also, “I agree to the recording of my voice in this session.”
If they refuse, you cannot share the recording. In court, the recording could have been tampered with, there are legal ways for trained people using certain equipment and with permission to record and produce as evidence.
There was an issue in a particular university where a student recorded high up staff bullying him, and he made everyone aware he had the recording. Although the staff member blocked the recordings release by not giving permission, the fact it was blocked meant everyone assumed the bullying must be true. Legally? Hmm, I go by my assumption nowadays that “people are c**ts!”
Now, companies who state they are recording you, you can say “no!” and they don’t know what to do. They don’t turn the recording off, they don’t have the ability. One of these days I’m going to look into how legal it is for a company to record you after you say “no!”, how to FOI the recording and use to sue them for privacy breach in court, etc.