Our systems identify known nuisance calls and automatically blacklist these so that these the numbers are unable to call our numbers.
If you wish to block a call yourself then you can do access CALL BLOCKING features via the dashboard, which allows you to block entire number ranges, even countries on both inbound and outbound calls.
If you would like any further information on our call blocking then please contact our customer services team using our chat facility, or raise a support ticket via our website.