just hung up when my answering machine kicked in, so likely a marketer.

Caller: Breast & Prostate Cancer

Hung up as not local call and have never heard of the charity, was live person, but took ages to pick up the call

Caller: unknown

caller did not leave a voicemail

Report it to police if you have a copy of the email you sent. Hit them with an harrasment order.

Spam

Caller: My Charity Survey

These people have rung on multiple different numbers - all out of area numbers ae blocked.
They have been told via email to remove our number from their calling list(s) but have failed to stop calling.