Duplicate URL issue

I have had huge problems with sh404SEF generating duplicate URLs and I have not found a developer who can fix the issues on my site. Ome example is as follows:
www.geoffbrandrealestate.com.au/real-estate-shop
www.geoffbrandrealestate.com.au/real-estate-shop.html
www.geoffbrandrealestate.com.au/real-estate-shop.html/
www.geoffbrandrealestate.com.au/real-estate-shop/
www.geoffbrandrealestate.com.au/real-estate-shop/Print

As a result my rankings have been smashed

Hi Geoff Brand,
It's the issue of sh404sef component. It creates the sef urls depend on the system plugin of it. To solve this issue, you need to upgrade to latest version of Sh404sef, purge the urls or remove the fake urls from that Url Manager function in Sh404sef component.
Thanks
Dam

Thanks Dam, I did what you said and it has not fixed the issue. For example, the site still generates .html & .html/ - but the '/' is not showing in the URL manager.

Your suggestion did reduce the total number of URLs by 35!

However, I then went back and removed more URLs & a few minutes later they regenerate again.