Sponsored Program no longer produced

What do you do when regularly scheduled programs are no longer produced and your not notified of it. I have 2 Sunday morning programs that appears to have went bye bye without notice. The last program seems to have been produced late Sept - early Oct. I've sent email and messages to the producer and no response. I'm currently looking for a couple programs that can fill a 2-3 hour timeslot on Sunday Mornings. I'll probably run repeats of the last shows for 2nd and 3rd week, this Sunday. Then filled time slots with repeats of a weekday and Saturday programs starting next week until replacements are found.