How do I block numbers that constantly call? - Uniden PowerMax 5.8 GHz Cordless Phone Digital Answering System TCX800

To block numbers that constantly calls, just add them to Harassment Intercept of LEO Privacy. I have used it for 1 year. LEO Privacy Applock Hide Safe Android Apps on Google Play

The ability to block calls is usually a service provided by your local telephone company. Contact them to determine which services (if any) they offer. They go by names such as call blocking, blacklisting, do not disturb, etc. and are for identical or very similar situations you want to solve.

You may also purchase a device it connect to you phone line. Some require a subscription and others do not. Some may work on specific types of calls and others may be better or worse. Check the out here:

Amazon com call blocking device