you definitely got an idiot who doesn't know the difference between dlm resets on adsl/fttc. either nothing will happen or it will be spotted and an engineer sent.
regarding what BlackSheep says about OpenReachs policy that engineers should not perform a dlm reset unless a physical fault has been fixed, I think they need to make an exception for banding. It's become quite obvious recently that dlm is applying banding more often and earlier than before in its attempts to stabilise a line. It also appears to be sticking in most cases, even after a switch in product. a dlm reset by an engineer on site being the only way to remove banding seems a bit of a joke to me.