Phoned Unisuper

So I phoned Unisuper and told them I'd sent the form in twice to switch to defined contribution (or "accumulation" as they're calling it) and I'm wondering why I'm still in the defined benefit scheme. The guy I got on the phone told me that everyone starts in Defined Benefit (so they just ignore the initial membership form despite it asking which plan you want to be in) and that they got my switch form in May but "it takes a long time for the switch to happen" and he doesn't know why that is.... He said it was "fair enough" that I was wondering what was happening. So I suggested I'll check in another month whether the switch has happened. Which he said "makes sense".