Oh I didn’t know they could just call you without a UC50 or ESA50.
It could be problematic for people on UC that don’t receive a decision letter via post and if it’s not on the journal and you miss the MR deadline that would be a big hassle . I would probably suggest just calling up UC all the time until you get the info over the phone. I messaged my case manager almost a month ago now about the decision and they haven’t bothered to get back or leave me a message.