"Scary experience"

I sympathize with previous comment on breast surgery. I have just received a letter from this clinic with the date of my breast surgery next week. However, few weeks ago I was discharged from the clinic and told I don't need any surgery and my lesion is benign. The letter with the surgery date and pre-assessment for general anesthetic scheduled really scared me - there was no additional information supplied. I'm trying to call the clinic and get any information but no one is answering for past three hours. I don't know whether they mixed up the patients or whether they realized that my biopsy was indeed positive for cancer. I'm really scared and confused. I just hope they answer the phone!