Who called from 5878802064

This calling a few time in a week with no messages

they are phoning me daily no message on my machine

This number is from a Collection Agency and calls frequently. Do not answer. They have just taken my time from me and impeded my progress in my work. Is this right, or even fair?

Very annoing, calling almost  once a day, never living any message. Coul you bloc the number?

Calls frequently .......leaves no message......would like them blocked.....very annoying......