Grace Nyaboke has filed the complaint against Postbank for disobeying a court order excusing her and two of her colleagues from working on Saturdays because they are Seventh Day Adventists.
She has also accused the bank of victimising her on account of her beliefs by interdicting her and putting her under investigation after the order was issued.
Nyaboke also contends that she and her colleagues cannot be accused of failing to do their duty as they work on Sundays, through their lunch breaks and extra hours in the evening to compensate for their Saturdays off.
The three have however received temporary reprieve after Industrial Court Judge Linnet Ndolo barred the bank from disciplining them pending the hearing of the case on November 14.
At which point, the bank will also have an opportunity to respond to the accusations levelled by their employees.
As part of their faith, Seventh Day Adventists set aside the hours between the setting of the sun on Friday and Saturday for worship, rest and fellowship.