"Arrogant and Unhelpful"

My hospital consultation saw me on the 13/12/23, she recommended to increase my medication from 5mg to 10mg, 7.5mg then 5mg at 3 weeks intervals. I received a copy of her letter weeks later on 10/01/24. So I rang the surgery on 12/01/24 and requested the increased dosage. The PersonX refused to approve 10mg to me because according to her, since the letter was dated 13/12/23 and so the ‘start’ date of the new 10mg dosage was already over. She was only prepared to approve 7.5mg and not 10mg. I tried to explain to her that I had not ‘started’ on the new regime since I only received the letter on 10/01/24, and I could not possibly make the new request without first having received the hospital letter. I reasoned with her that the logical ‘start’ date would be the day I make the request, and not the date of the letter. When I asked why she had to take 13/12/23 as the ‘start’ date, she said arrogantly ‘this is how we do it here’. She said she would give me an option which sounded like an ultimatum, that I had to accept ‘7.5mg or ?.....’. She was most unsympathetic, unhelpful and steadfastly rejected any rationale by repeating to me ‘this is how we do it here’. I was so stressed out by this whole frustrating and most unpleasant episode. I was emotionally drained after this. It is unbelievable as I have never experienced such awful dealings with the surgery.