Hi Tonya, this article will show you how to get rid of that knotweed - https://www.wikihow.com/Get-Rid-of-Japanese-Knotweed
This article might be helpful Tonya
To destroy any Japanese knotweed remains on site, allow the cut canes to dry out, then burn them. On no account add them to your normal household waste. When digging out, remove as much root as possible, then repeatedly destroy the regrowth (eg by mowing).
This video is very useful to do it yourself: https://www.youtube.com/watch?v=tWnLlNRmE5M
Hope it helps