The Uber drivers behind a landmark employment rights case last year are suing the firm over claims it failed to provide them with information under GDPR.
Four drivers including James Farrar and Yaseen Aslam, whose worker rights case will reach the Supreme Court this year, said Uber has blocked them from calculating potential money owed in back pay and holiday pay.
They claim that the company failed to "respect their digital rights under the General Data Protection Regulation [GDPR]" by not granting them a copy of their trip ratings, performance data and the duration of time that they worked.
The GDPR laws introduced last year mean that anyone is entitled to a copy of the data that a company holds on them.
Mr Farrar said: “For too long Uber has used its technology to abuse its power over drivers and deny them even the most basic of workplace rights.
"It collects vast quantities of personal data from its drivers and uses algorithms to surveill, manage, nudge, penalise, reward and even fire workers from behind the digital curtain. "
Ravi Naik of ITN Solicitors, who is representing the drivers, said that this case will be a "stress-test of Uber’s commitment to data protection".
Mr Aslam said the company is using their technology to exploit workers.
"This is further proof that gig economy employers like Uber manipulate our data behind the curtain to make huge profits for themselves while placing us at a financial disadvantage," he said.
The topic of pay has been contentious among the ride-hailing firm and its drivers.
A report from Oxford University last year revealed that Uber drivers were taking home £11 an hour, £4 less than the company's estimates before driver costs.
The firm also faced a backlash in San Francisco and San Diego after changing its pay structure in 20 cities across the US to give more money to drivers with slower, shorter rides than those with longer trips.
The company has toyed with the idea of a short-term staffing businessin the US ahead of its planned IPO this year.
An Uber spokesperson said: "Our privacy team works hard to provide as much information as we can including explanations when we can’t provide certain data such as when the data doesn't exist or disclosing it would infringe on the rights of another person under GDPR."