Heat84 Ting, which is T-Mobile.
Have you looked at the Ting suggestions?
https://help.ting.com/mobile-articles/call-blocking
Whether you have an iPhone OR an Android, each of these phones has built-in spam blocking available.
The volume of calls you describe is truly outside the norm.
Not to be paranoid, but is it possible that someone in particular really has it in for you (old girlfriend, stalker, collection agency...)
Have you tried to see if your phone number could be confused with another one (pizza shop, escort service, popular restaurant...) hence the inbound calls.
Do the calls come from some pattern of area codes, or are the area codes truly random?