Yes there is. Phoning someone and saying "This is the police", followed by a pause, is calculated to raise people's heart rate and stress them out. They know that because they follow it up with "don't worry" - people shouldn't be worried in the first place. It deliberately plays on people's fear, and that's despicable.

Then there's the fact that some people fear repercussions for not donating. How did they get that impression? An honest misunderstanding, no doubt...

Then there's the repeated robocalling. That would certainly harass me.