someone using a list they bought to do magazine sales cold calling
claimed they were the account manager for the subscription and wanting to make sure all was in order (I had not gotten that magazine in 20 years)

I would like to buy 10 Euros for Voip Buster

This number is used by www.sparvoip.de to relay calls from their internet telephony service to landline phones. It could be that one of their many members was trying to call you using SparVoip.

? what company or person is this?