extremely terrible service

I had bloods taken 06 Jan 2020 then I receive a email 9 Jan saying that the account is 30 days overdue and nearly an extra R1000 extra added on the actual statement must be paid,firstly how do they count 30 days if it's only been a not even a week secondly I wish I could upload the bruising that their so called professional sr left my whole arm blue black and green. Iv'e taken pictures and it looks worse every day that goes by. firstly please learn how to count and get professionals to draw blood, i worked at lancet years ago never seen anything like this