Hey OP!
I’ve read the full thread and just wanted to comment. I feel like this is one of those situations where the GP surgery can’t win, but equally you’re not at fault for being upset. If I got a voicemail in a similar situation to yours, I know I would be frustrated and annoyed because even though they say don’t worry, it’s impossible not to isn’t it!

They needed to offer you a smear, and unfortunately due to confidentiality they can’t leave a voicemail and if they had tried to call you multiple times that would have taken too much time and probably would have been more worrying (I would be sooo stressed if I had multiple missed calls from my GP!) Leaving a voicemail but explaining not to worry was probably the best way for them to approach it, although I fully appreciate it still causes worry because I would be the exact same! They tried to tell you in a way that would cause the least concern but you’re not being unreasonable for being worried either (and ignore anyone who says you are!)
I don’t agree with your comment about it being a scare tactic but I think you were just (understandably!) a mixture of upset and relieved it was all ok when you said it- some posters are just being absolutely ridiculous tearing you apart for it. You were clearly upset so people really need to give you a break. They weren’t trying to scare you into getting the smear but when you’re worried and upset it’s understandable it seems like this.
I’m not old enough for a smear test yet (I’m 23) but I’m already dreading it. I fully appreciate it’s so important but it fills me with fear thinking about it. It’s extremely personal and not for any other posters to lecture you on. If you’re getting offered a smear I’m presuming you’re older than me so I’m sure you’re old enough to make a choice about your own body!
Sorry for the long post, I just felt bad for you with the other comments as some were quite nasty. Your comment about them scaring you into it was a bit unreasonable but completely understandable given how worried and unwell you are and even though they weren’t trying to scare you into it, I can see how it would feel that way
I really hope you feel better soon
x