Unhappy Revolut customers have complained in their droves, with new figures revealing the firm accounted for eight in 10 of all grievances about digital banks in the past 18 months made via Resolver, a dispute resolution service.

Around 3,100 consumers lodged cases about digital banks with Resolver during this period. Of these, 80pc were from Revolut customers.

Around 20pc were from Monzo customers, and fewer than 1pc were from Starling. Revolut has a disproportionate number of complaints compared with its market share of the three banks.

Revolut’s share of complaints outweighs its 66.4pc market share of digital bank customers. Monzo’s market share is 25.2pc, while Starling’s is 8.3pc.

Most complaints related to accounts being frozen, difficulties in contacting banks and disatisfaction with customer services, said Resolver’s Martyn James.

He added: “Often it’s all three. It’s disappointing to see this from the digital banks that promised to transform the industry.”