Continuing its year of mass outages, Telstra has apologised to thousands of Victorians who lost NBN services on Saturday.

Complaints surfaced online indicating faults with NBN services provided through Telstra, across Melbourne, Ballarat, Warragul and other regional areas.

These complaints indicate the problem existed from at least mid-afternoon and peaked around 7pm. Service restoration continued during the night.

Telstra has acknowledged this outage occurred, stating the root cause was a faulty switch at the Exhibition St exchange.

As part of legislation surrounding the NBN when NBN services become available there is a fixed time period where residents and businesses must switch over before older infrastructure is disabled and no longer available for use.

As such, these affected Telstra NBN customers lost voice and data and could not make calls or connect to the Internet.

Telstra states the faulty switch problem was fixed by 7:30pm on Saturday evening with services progressively restored as the night continued.