Royal Society for the Blind. Pushy call centre workers who won't take a polite 'no thank you' for an answer. They keep pushing until you have to slam the phone down. They are not doing this charity any favours with their attitude.

Constant nuisance calls - usually just 3 rings - I never bother to pick up

I called back the number (02) 8020 1205 and reached vm that said I reached Heart Research Institute

No-one there when I answer, sick to death of this number ringing me 5 or 6 times a day.

Royal society for the blind

weird!
They call and leave a really hard to understand message offering an opt-out option and nothing else.
And the number they called was on the 'Do not call' register.

bl..... nuisance value only

careflight wanting money aparantly