You can’t call in advance and pick up the receipt an hour later?
I just send an email what I need, they reply to me the same day or tomorrow that it's ready to be picked up. I got there, and get it in 2 min.
In most places it is hard enough to even get an Hausarzt to being with. You might just be lucky to live in a bigger city where you have the ability to choose.
LoL ok, just that GPs have no shortage of patients, but the other way around so since they're on such high demand and in low supply they can get away with many things. The market is in their favor by far.