Two brothers screamed threats at staff at a double glazing firm believing they owed their father money in unpaid wages.
Rhys and Jordan Cottrell stormed into the Window Doctor offices in the Llantarnam Industrial Park, Cwmbran, demanding cash and to speak to the company owner.
The pair were caught on CCTV screaming threats at two female members of staff who were in the offices at the time.
In the footage, Rhys, 28, and Jordan, 24, can be heard shouting: "Where the f*** is Dean?", "get Dean here" and "you're f***ing dead" to the two women before finally leaving the building.
The business' owner Dean Cubitt, 53, said the two men burst into his offices shortly after he left at about 9am on July 31.
He described the ordeal as "horrific" for both members of staff.
"They pulled up outside the office," Dean said.
"They came in and they are screaming and shouting over their dad's company bonus that is given at my discretion anyway.
"They started threatening the girls. They actually threaten my son on the video as well."
At the end of the almost two-minute tirade of abuse, both men leave before Jordan Cottrell returns through the front door.
He can be heard shouting: "Make sure that money is at my house today. Today. Or you're fucking dead."
Dean said one of his staff called the police while the two men were still inside the office building.
Both women were left shaken by the incident.
"I was just lucky," he said. "I turned around and came straight back.
"I felt so bad for them. I fear that if I was here they basically would have beat the s**t into me.
"I would rather they had done that than treat the girls that way in the office."
Rhys Cottrell and Jordan Cottrell, of Parc Panteg, Pontypool, each pleaded guilty to a single count of affray at Cardiff Crown Court on Tuesday.
Judge Michael Fitton gave both of them a four-month prison sentence, suspended for 12 months, and ordered them to carry out 150 hours of unpaid work.
Dean said he is not satisfied with the sentence the two men received.
"That's not justice in itself," he said. "For weeks and weeks after these girls had to lock the front doors every time I left. It's not so bad now.
"I'm just really surprised."