to block voice calss

I am getting calls from many nos.and  continuously calling me  since almost 7-8 days with many different no. m just getting frustrated  with getting these calls.

Kindly  help me out to stop all these following nos--- +91918287678902, +3784003369, +3669844158, + 3633240104, +3628084532, + 3620660430, +966541647543

Also pls  advise what if that person again calls with further new nos how can i block that.