Has anyone had experience of childline?

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My kids secondary school gave them info about childline in assembly saying they can call about anything, if they are anxious or want to talk about their day. I’ve had a look online and it looks like a good resource for when teens want to talk but not always to a parent.
But their have been news reports of childline letting down teenage girls and giving some rather suspect advice.
I was wondering of anyone on here has first hand experience of childline, either as a volunteer - (what qualifications/ experience do they need to have?) Or if their loved ones have called?

First time posting- predictive text meant I've posted with grammar/ spelling mistakes (their!!!) and I can't work out how to edit. Apologies to those who find this really irritating! (Like the inappropriate apostrophe catastrophe!🤣)

Three dots in the top right of post > edit is at the bottom of the menu.

Thanks but that doesn't come up on my original post. (The one with the errors). So I can't amend it. It comes up on this comment but not the orginial post. I was just apologising to those who hate those types of errors. It's the info on childline that I'm hoping for some feedback on.