The Ministry of Energy stated that they had fulfilled all their obligations.

The Russian energy company Gazprom is suspending gas supplies to Bulgaria.
This was reported in the Ministry of Energy of Bulgaria, writes Nova .play video
Today, the largest Bulgarian gas distribution company was notified that natural gas supplies from Gazprom Export LLC will be suspended from April 27, 2022.
“The Bulgarian side has fully fulfilled its obligations and made all payments stipulated by this agreement in a timely manner, strictly and in accordance with its clauses,” the Ministry of Energy noted.
(C)UNIAN 2022