@danjack - Assuming you have a recent Samsung Galaxy running the latest OneUI 5, you can try the following to see if it resolves your issue. Note that this depends on the Samsung phone type and OneUI version you have installed.
Go to Settings > Connections > Bluetooth
Under the Paired devices section, find your headset device and select the cog icon
This should display another window with your headset device information.
At the bottom of this window you should see the Audio device type setting where you can change the device type to whatever option suits you best.
Hope this helps.