According to The Sun, the group have received an £84,000 bill from the show's production company Antix.
The nine-page writ is said to include claims of £6,000 for the services of presenter and producer Yvette Fielding and £9,210 in hotel costs.
The musicians are also reportedly being charged £1,450 for loss of deposits at filming locations Chislehurst Caves and West Norwood Cemetery, £3,000 for a researcher and £500 for food.
If N-Dubz had filmed the series, they would only have received a fee of £1,000 each. Meanwhile, band member Tulisa reportedly has a doctor's note explaining that she had exhaustion.
A spokesperson for the band said: "They will fight this all the way."