It sounds like the fault may lie with your GP, as they are your first port of call. They have your records and should ask the relevant questions.
When I had my third episode of pm bleeding in august, I literally emailed the surgery, telling them so. They then passed that information directly to the gp, who actioned a 2week pathway referral that day.
Appointment came through within days and biopsy done a week later.
Your GP has let you down. I would write to the practice manager and ask to arrange a meeting between you, the practice manager and the GP who did the referral. The GP will know you are post menopausal by looking at the type of Hrt you are on.
Did you get in touch with either gynae or the GP, after you had received no appointment within 2 weeks ? Gynaecology would be able to tell you if a referral had been made and if so, what type.
I think i would have also reminded the Gp that NICE guidelines recommend a referral on the 2 week pathway and could they double check this has been actioned, as you’ve been waiting so long.
Hope you get some much deserved answers soon.