Malpractice?

I donated blood again yesterday for the first time in 20 years. Firstly, they have no record of previous donations which have to total in excess of 15. First mistake. I filled in all the forms religiously, and waited for my turn. Entered, the trailer, handed in my papers and was shown to where I could choose which arm to use. The sister that cannulated was friendly and professional.

Some time later I was approached and asked about my answers on the questionnaire. Yes I had basal cell carcinoma surgery in Feb. Only to be told that I could not donate within a 3 month period as "this could cause a recurrence" Never heard such hogwash in my life - it isn't systemic - its skin cancer ON THE SURFACE. I asked so how much blood had they already drawn - 300ml which would be thrown away. Not used for plasma - nothing - just discarded. So much for recurrence of the BCC? I am furious! Why did I bother to fill in the questionnaire if no one was going to read it! Why cannulate then draw 300 ml and then told donation could cause a recurrence! Had I not JUST donated? Is a recurrence only for amounts over 300ml? This borders on medical malpractice! I look forward to seeing a reply