@rickD i can understand your frustration and confusion...
But it is your reseller who should solve this problem.
You have the document that states that SBS should be converted into BPP licenses instead of BP licenses.
This you can use with your reseller and tell him:
Look in the document you send me it is stated that current SBS licenses should be upgraded to BPP licenses (because of Exchange/Sharepoint), you delivered me the BP licenses which are not compliant with the licenses that i bought. Please send me the correct licenses.
He sold it wrongly to you, so he should also fix it for you WITHOUT extra costs.