Dear Annoying Salesperson at Vendor We Never Buy From:
The boss is never going to return a call where you're just "checking in". He doesn't have time for such nonsense. I'm sure there's a very good reason why he has never bought anything from you in the two and a half years I've worked here. So how's about until you have a real reason for calling him, you stop wasting my time with your pointless weekly calls?
Thanks much,
The Perturbed Secretary