camellia roots-how to get rid of

Being a beginner I need some help on the following- I have a patio with small areas to plant. One of them has a Cammelia roots, rather large and would like to get rid of them as I'm planning to plant a smaller shrub near these roots. The Camellia has been cut about a month ago, what is showing are four stumps of about ten centimeters.
Would be ever so grateful for any advise.
Many thanks in advance. M
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