In all probability, Lloyds are reading from a script and/or what their systems report on a screen, which says it was "authorised" by yourself when it probably wasn't. These things can grind away at you like you did something wrong or let your guard down, but most of the time it was nothing you did or didn't do. Sometimes you unfortunately just get hacked. Your details will be somewhere in an online dump, and someone got lucky for a short time. They will have already moved onto the next victim. Unless Lloyds are willing to give you more detailed info on what their systems show happened (tip: They won't) then you will never know the true extent of what happened.
I would try to move on. This will likely never happen again. I mean if it does, then you can worry.