Got it. After getting up to 4 phone calls a day for Betty Bar**** (garbled name), I think I'm finally off the list.
Call Sprint at 1-800-456-6070
and press 4 (customer service)then don't enter anything when prompted to enter phone number; press 6 (service representative)[you will have to do this step twice]. Ask to be transfered to a "lead representative in the finance department." They can send an email to the correct department to get your number removed from the "automatic dialer" to take effect within "72 business hours."
After being on the phone for about two hours over the past two days trying to get off the list, I made it through the above sequence (to test it for y'all) in under 5 minutes. Well worth the effort if you've also been receiving up to 4 phone calls every day! Good luck!