Hi Linda, good on you for fighting through. I read that a lot of women end up unemployed after treatment for breast cancer after full employment prior to diagnosis.
I really admire you for what you have done, and the strength and persistance in the face of such difficulties and unfair treatment. With my chemo brain I could easily get a date wrong for an order. I don't know that they can legally dismiss you without at least one written warning for making a single mistake, esp if you did rectify the problem. But the important thing is to make the new job work well. I really hope it suits you well and that they are good people to work for.
Arlene Chan, oncologist at the Mount Hospital, 150 Mounts Bay Rd, Perth, WA s doing a research study into survivorship and is very interested in how employers look after employees with breast cancer. So you may like to contact her and see if you can be part of that trial/study.
All the best