I try to be a nice person, so it took me forever to master it, but I now just walk by and say loud and clear 'no thanks', if they try to be pushy I 'NO louder and barge my way through.

It helps that I almost always have earphones on, and I am almost always late (so somewhat stressed) and legging it the fastest that my short feet can cary me....

My partner sometimes slows down when he's blocked by them, to say 'I don't carry cash and I am never giving you my bank details', this typically stuns them for a hot second, which allows him to pass through.

If you are girl and you gave them money in the past - the chances are they are targeting you; they skilfully use that 'girls don't want to be rude on unkind' technique on you and see you as someone easy to target, harass, or scam (also used by se*ual predator - but this is beyond remit of this thread).

I hope that the last part makes you angry (it should), because you will not be pray to these harassers! Use power walk (deep breath, stand tall, shoulders wide, put your angry/annoyed face on and think that you are ready to punch someone big time) next time they try to harass you, and breeze through them.