Bridgeit
Turning this around, just think how difficult it must be for appointments to be booked when folks have other varying priorities, staff must be at their wits end trying to accommodate everyone .... I for one wouldn’t want to holiday anywhere at the present moment .
I think that the best way would be to let everyone know what the system will be to get their second jab, so that they/we can work around it. Life has been on hold for so long now that when people can finally make plans it is not reasonable to expect them not to make them.
From the sound of things, the OP was working on the assumption that the system that had been in place before she went away was continuing. Why wouldn't she? The receptionist could have told her when she called that it might not be possible to get an appointment, rather than saying nothing. Communication is so important in situations like this, and it sounds as though the lack of it has created the problem.
The second incident could easily have been human error in the first place, but there is no excuse for not apologising for leaving someone out in the rain for 15 minutes.
I agree with those who suggest that the OP write a letter to the Practice Manager. I appreciate that it must be tricky at times to be a medical receptionist, but at the same time, they are dealing with people who are likely to be worried, unwell and possibly a bit scatterbrained as a result. Their training should prepare them for this, and teach them how not to be rude.