United Mobile+ (new service with +44 Jersey number)

[inquisitor]

Today it's my fifth day in Bulgaria and UM+ still doesn't work nor have I received any feedback on my complaints, which I first registered on Saturday afternoon and specified with additional details over the last days.
Since today callers hear an announcement saying "your account has been suspended", which I only heard when I tried outgoing calls before. Actually a bit embarassing for me if I'm called by business partners, whom I left my UM+ number, too and a shame for UM+, that they can't even setup an "unavailable"-message in such cases.
As the only Bulgarian roaming network "M-Tel" is owned by Mobilkom Austria, which in turn owns Mobilkom Liechtenstein and so the platform of UM's +423 service, these problems with the competing Jersey Telecom-based UM+ SIMs could be intentional.
Anyway UM is disappointing very much this time.