HI @Nic-J Some customers with issues previously found Memory Foam Tips offered a solution. one thread here https://eu.community.samsung.com/t5/wearables/ear-infection/td-p/3645665
Amazon ones here https://www.amazon.co.uk/s?k=memory+foam+tips
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 5.0,Android 13 .
If you are based in the UK or Ireland then please send a private message to Sam_UK by following the steps in the link below, and I or one of the other mods will be able to get this escalated for you.