how do i set up a black list on my land line
What you need to do is buy a call blocking or call guard phone that will store the nuisance numbers.
If however you are getting scammers calling you, then only a call minder facility will work, as these only let through numbers on your contacts list.
Scammers spoof numbers, which constantly change from call to call, so you rarely see the same number twice.
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You can get 'withheld' numbers permanently blocked, the trouble is it's a chargeable feature! Ring Virgin media to get it set up.