TSB ignored employees' warnings that the bank was not ready to switch over its IT system in the months leading up to the online banking meltdown, according to a union.
The TBU union claimed in newsletters for its members at TSB that staff were pressured to work overtime to meet the deadline for the system upgrade.
The newsletter, which was published by MPs on the Treasury Select Committee on Thursday, said staff were worked to a “frazzle” and some were not given enough time to complete required training.
It claimed staff faced a “sickness epidemic” with absences increasing by 25% in some business areas due to the stress of dealing with disgruntled customers following the IT crash.
Staff were “teetering on the brink of collapse with staff working 12-hour shifts without breaks” and dealing with “levels of abuse never seen before,” the documents said.
Hundreds and thousands of customers were unable to access their accounts for weeks after TSB attempted to migrate its retail operations from a system run by former owner Lloyds Banking Group PLC (LON:LLOY) to a new one built by a subsidiary of its new Spanish owner, Sabadell, at the end of April.
The Financial Conduct Authority is investigating the issue.