Incessant harassment of robo telemarketers

Received incessant robo calls from 10 different DSTV / Multichoice contact numbers in 24 hours (identified after the fact with updated Truecaller). Most calls are dropped or dead on the other end of the line. Received more than 15 calls in 24 hours (most within a couple of hours). This is excessive harassment and invasive, abusive conduct which must be stopped and made ********. I've blocked all 10 numbers but who knows how many more are to come. Disgraceful.