I agree with you MN regarding the robot answering and the receptionist wanting to know why you want to see a doc but remember they are trying to filter out things like repeat prescription calls and others where medical intervention is not required. GPs have a tough job that has got harder to do over the last couple of decades. They are also combating decreasing numbers and other staffing shortages whilst at the same time coping with an increased workload since the pandemic. The BMA survey this.
Tell the receptionist (get their name first) you have a medical condition that you wish only to discuss with your GP and if they give you trouble tell them you’ll make a formal complaint regarding patient confidentiality and remain polite but firm and insistent.