Telstra has apologised for an outage that brought trains to a halt and left thousands of NSW customers unable to access phone and internet services overnight Monday.

Telstra users were furious when they released they were unable to make or receive mobile phone calls, and could not use landline telephones or the internet for five hours.

A spokesman for the company said the state-wide technical issue had been resolved. Reports said maintenance repairs could have caused the glitch.

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But the Telstra website revealed some customers in the Seven Hills area may not have broadband cable and FOXTEL access restored until Wednesday.

The outage also caused trains to stop for about one hour on the Southern Highlands line, with Sydney Trains bringing eight buses in to transport 350 commuters.

Calls had been answered with a prerecorded message advising customers the area they were trying to call was “congested”, News Corp reported.

Frustrated customers then took to Twitter and Facebook to complain, including Australian cricketer David Warner who wrote: “Oh dear @Telstra this is not good.”

Telstra tweeted him back, “Hi David the outage in question has now been fixed”, which prompted this reply from the sportsman: “Really appreciate that, lots of problems this year though!”

Oh dear @Telstra this is not good pic.twitter.com/tsSKZnNEjr

— David Warner (@davidwarner31) June 1, 2015

@Telstra any information on internet outage in Byron Bay? Area code 2481. Haven’t had connection for almost 3 hours now. — Melmo Jenkins (@MelmoJenkins) June 1, 2015

@ckairouz we do not have a estimated restore time to resolve the Cable outage, apologies. – Kath

— Telstra (@Telstra) May 29, 2015