Aggressive donation asking

For the past 2-3 months I’ve been seeing the same guys (usually wearing red) asking for donations here at Woodlands CWP. They carry the same brochure and it’s something about donating for mothers? Idk is this actually legal?

I’m quite certain they take a cut from whatever is donated (just speculating) and it’s usually the elders that are donating. Worst is they will follow and pester you to donate then move on to their next target. Can something be done about this?

Now they hang around the ground floor bus interchange escalator where human traffic is much heavier. People in woodlands 1000% will have come across them. LOL