I had my boob grabbed by a nurse in hospital - it was quite a bizarre experience - I'd just had an emergency CS after a 36hr labour, DH had decided he was going to go home as he was 'tired' and while they were looking for a porter I was left lying in a side ward on my own, the buzzer had been looped over the top of the bed so I couldn't reach it (couldn't physically move!) and DD started crying.
I realised I couldn't reach the buzzer, couldn't move to either pick up DD or get the buzzer, started calling out in a very english way 'erm... hello? Hello?'
A nurse walked past (no idea who she was, never saw her ever again), stuck her head in, asked if I was okay, I explained that I couldn't move and my baby was crying, she picked up DD and gave her to me, then suggested that even though my milk wasn't in yet, she would be comforted by nursing.
I put her to my breast, the nurse asked was it my first, when I said yes she literally reached over, grabbed my boob and pinched it up around the nipple, saying (in a broad yorkshire accent) 'baby can't eat football, love!' and then got her latched on.
Then disappeared. It was so surreal I'm still not sure it actually happened, but all the midwives (when I finally did make it down to the maternity ward) were very impressed that I knew how to get DD to latch on... I was so out of it that I didn't realise they weren't supposed to touch you - but I'm quite glad she did
Your midwife assistant whatever sounds awful, though. Can you complain to anyone?