I'm sorry that this happened to you Javic It should never happen. Ever.
But unfortunately it does, and it's not all that uncommon in maternity practice - for some reason informed consent is not greatly valued by some practitioners in the field.

My OB performed an episiotomy on me without asking or informing me first. I was aware of it, and accepted it atthe time as I had a forceps delivery adn believed it was required in that context. However, in hindsight I realise there really was no excuse for not at least informing me first (and really I should have had the option to refuse). I've heard of women not even knowing they'd been cut till their doctors stitched them up afterwards, or they dsicovered stitches later on!