Some Bomen businesses have found themselves cut off from the cashless economy after Telstra's business phone line and eftpos services were severed this week.
Telstra blamed cable damage from construction works by a third party for the outage.
The manager of a business in Bomen, who asked not to be named, said they had originally told that their services would be restored on Tuesday night.
"We've been dealing with angry customers who are not happy with us not being able to provide our usual service," she said.
"We have lost phone orders, we're unable to fax orders to our suppliers and suppliers are unable to contact us.
"We can't take eftpos sales. We're losing sales with customers who do not carry cards but use phones or watches to pay. There's no access to an ATM."
Telstra had been advising customers via text message that network upgrades could disrupt mobile services at Bomen this week.
Telstra regional general manager Chris Taylor said the phone line issues were entirely separate.
"This outage resulted from accidental cable damage by an external party who was undertaking private works," he said.
"We expect services to be restored on Friday."
Mr Taylor said it was "possible although unlikely" that customers of other providers could be impacted "because the disruption is only affecting a small number of ADSL (fixed line internet) services."
The Daily Advertiser spoke to three other businesses in Bomen on Thursday but they had not experienced any complete loss of landline phone services.
As of Thursday afternoon, Telstra's outage report website stated that some areas of Bomen would have their business phone services restored on Monday.