We are with BT for internet and landline, O2 for my mobile 'phone, whilst herself is with EE.
We get a small number of spam calls on the landline, few enough to be ignorable, none on our mobile 'phones, and occasional spam emails, again few enough to be ignorable.
Years ago, I used to get a large number of spam emails: using Thunderbird, I simply set suitable message filters, and at the moment I have two set, one of which is for what looks like a genuine mistake somewhere in Argyll County Council.
We used to get a large number of spam calls, so as our cordless 'phones included the facility of incoming call barring, I set it up to bar up to 30 calls. Today we have 4 set, and I cannot remember the last time the system barred a call (it usually shows the caller with a red x against it.
I did, on one occasion try to lead them on, but lost interest, and now we simply say "Not interested" and clear the call if a human voice. Otherwise we just hangup.
Peter G. Shaw