SYDNEY, June 18 (Xinhua) -- The chief executive of telecommunications giant Optus, Allen Lew, has continued to apologize to Aussie football fans on Monday, after its streaming service once again failed, for the third consecutive day of the Russia World Cup.

"I apologize unreservedly to all Australians," Lew said.

"We should have done better, we can do better and we will do better."

With the airing rights to all 64 matches, Optus charges mobile customers 15 Australian dollars (11 U.S. dollars) per month to stream the World Cup and the English Premier League.

But with droves of fans down under unable to watch the group matches, many of them took to social media to vent their anger and demand refunds.

Among the irate fans was former Socceroo Robbie Slater.

"We all just want to watch the FIFA World Cup but we can't!" he tweeted.

"Shame on all of you! And you know who you are!"

A prominent sports columnist also chimed in to voice his frustration at the lack of coverage.

"Dear Optus Sport, the only way out is to hand over your World Cup coverage to a proper TV network," Richard Hinds posted to Twitter.

"Surely, otherwise, the loss of goodwill is catastrophic. Not to mention the simple decency of allowing football fans to watch the world's biggest sporting event. Please?"

During the first incident in the match between Egypt and Uruguay on Friday, the company blamed "an extremely high number of viewers" logging into the platform just before kickoff as the reason for the systems to overload, which caused playback errors and problems buffering.

But over the weekend, the issues have continued.

On Monday afternoon however there remains hope, with Australian Prime Minister Malcolm Turnbull coming to the rescue of soccer fans down under.

"I have spoken with the Optus CEO, Allen Lew," Turnbull tweeted.

"He assures me he is giving the World Cup streaming problems his personal attention and he believes it will be fixed this evening."