Megaphone blocked some O'Light sim cards

Today the phone has stopped working. I didn’t accept incoming calls; it was also impossible to call from him. When trying to check the balance, a bummer also occurred.
On the phone, the girl said to change the sim card in the office.
When I came to the office, it turned out that I was not the only one. Everyone has the tariff `Light. None of the managers give comments; they refer that they do not know.

Who else ran into this and who has clear information about this, or is it somehow uncomfortable with everything that is happening?