I recently had a situation between my doc surgery and the endocrinologist. Quite a different situ than yours, but also somewhat similar.
The doc surgery conducted a medication review on the phone. I found this refreshingly convenient. However, as a result of the review they inexplicably decided to discontinue a medication I have been on for nearly 20 years (cabergoline, supresses excess prolactin production from a pituitary gland tumour).
Once I got over my astonishment, I rang the endocrinology clinic, spoke to the secretary and explained the situation. Asked for my next appt to be brought forward to the next possible date, which was 2 months later.
However, I was delighted to receive a letter within the week. Written by my lovely endo, addressed to my doc, copied to me. It stated v clearly that the medication should continue until the endocrinology clinic states otherwise, in writing.
I had the prescription from my doc within 2 days of that letter.
I should give your clinic a ring tomorrow. They have probably dealt with this situation quite often, especially with budgets tightening. (my cabergoline is not a cheap drug)