James Moultrie died just before Christmas at the age of 79.
Before he retired he had worked for the MoD and the couple had been living off his pension.
His wife Pamela, who lives in Dunfermline, Fife, knew that would change after he died.
“I expected it to drop to half the amount,” she said. “The full amount came in January – I thought it would just take a while to correct. But then the full amount came again in February.
“So I contacted them again and they stopped the payments completely, saying I would need to apply all over again for the pension.
“I’ve had no payments since then and no letters or contact of any kind. It’s worrying, it’s a lot to deal with on top of my husband’s death.”
In February, Capita appeared before the public accounts committee at Parliament to answer criticisms of its management of the scheme.
And in April it confirmed that some members’ data had been affected by a data breach.
Protests were held outside the company’s AGM in London on Monday.
Capita said: “We continue to work with the Cabinet Office to establish normal service levels.
“Additional trained resource remains in place, and our focus is on ensuring members of the Civil Service Pension Scheme receive the service they expect and deserve.
“We are sorry for the worry and frustration any delays are causing.”