Alison Williams, from Jarrow, says she is out of pocket as Capita grapple with a backlog of cases.
Civil servants from Charlwood and Fetcham say they have been hit by delays in pension payments.
Wirral woman Julie Morton said she has been left with "no income" after retiring on medical grounds.
Cabinet Office Minister Nick Thomas-Symonds says the waits faced by retired civil servants are unacceptable.
Civil service pension scheme failed to pay some pensions and lump sums after transferring to a new administrator.
The outsourcing giant accepted liability, after the data watchdog said they failed to protect client data.
A woman is calling for changes to be made after her sister was let down by benefits system errors.
More than 7,000 have been emailed or written to following a breach a month ago.
Colchester City Council "extremely disappointed" Capita failed to fully secure historic benefits data.
