Issue connecting website

Hi Guys,
We have purchased WPMUDEV and are very happy with it. It seemed the previous web dev company had purchased your product and connected the site to their dashboard. We have been successful in connecting all of our sites except for stayinnoosa.com.au. The site has 4 plugins that I cannot update because it is saying it is linked to another account holder. Please help. We would like to have all our sites under our plan and be able to update the plugins.
Thanks
Annette