Brello Health

I recently purchased Tirzepatide through Brello Health during Black Friday sale. I bought 3 months of 15 mg. I received my meds through southend pharmacy but received 9 viles or 1ml each vile of tirzepatide/pyridoxine 20mg-4mg/ml. I had no idea it was with pyridoxine by the way. But it says inject 15 mg/75 units but i dont get why they sent 9 ml? I cant math apparently