Why can't the medical system get it right???

So I knew I had another surgery coming up for my second biopsy. I just wasn't 100% sure if it was on the 20th orthe 24th of September. I called the surgeons office on Wed (yesterday) and got their voicemail..they wree closed for the day. I left a message asking what day and time my appointment was. Well today on my way to work I get a phone call at 9am, it's the receptionist..she snaps on me telling me my surgery is today. I said impossible it was scheduled for next week...she's like no I was there when I scheduled it I should know it's today. Well we have a problem I ate breakfast this morning at 7am. She had to call the doctor to see if it would still procedd or reschedule. Well I had a chance to do soem thinking and when she got back to me she said it would be close...no food 8 hrs b4..and I was 7.5hrs. I then explained that she wasn't there when I first came in she was yes I was...getting short with me now. Then I said her fill in was there....*LIGHTBULB*...Bingo...she had scheduled me for an appointment even b4 I came in the first time. she forgot to tell her fillin about it and her fillin shceduled me for the 20 or 24th can't remember. so after about 50 apologies for yelling at me I'm off to the operating room for a second time (possible...there's a very slight chance they cancel it as the anathesiologist would decline me as I ate prior to 8hrs...I will find out when I get there). People ask me often how Ican stand the waiting process and still be so calm and composed....I'm not really sure if the waiting process is what's getting to me anymore as the lack of communication amongst the medical field seems to be overtaking the waiting processes.