The following is a translation of the reply I got from the call centre of the Inland Revenue Department on Wednesday, June 25, on about 10 different instances between 8.30 and 11.30 a.m. and on Thursday, June 26 at 9.30 a.m.
"Welcome. This is the Department of Inland Revenue. The call centre is closed. The call centre is open from Monday to Friday between 7.45 and 4.30."
They say Gozo is "the island where time stood still". Maybe the clock at the call centre got stuck on midnight?