The girl group launched a London stage show, Viva Forever!, based around the band's hit pop songs, in December (12), but theatre bosses decided to close the production eight months early due to slow ticket sales.
The curtain will come down on the show for the final time on Saturday (29Jun13), and Bunton insists critics didn't give the musical a proper chance, telling Britain's The Sun, "For all of us it was heartbreaking. Okay, at the start the cast needed to get used to it and they needed a few things changing, but now it is just brilliant. We couldn't get past people being a bit negative and that is a shame.
"The Spice Girls always get a backlash but we fight our side and actually it is good now. We just didn't have that chance (to continue). Every night I have been, people are dancing and singing along. It is such a fun night out."
The musical was hit with a slew of negative reviews from theatre critics, who branded it "insultingly banal" and "tawdry, lazy and unedifying".