While their annoying voices may make you feel like you wanna punch their faces, my best advice would be to walk away. Don't give them any attention or even acknowledge they exist.
But if it looks like a safe space, i.e., well-lit, crowded area where you know you're safe or can be saved if things go wrong, it might not be the worst idea to tackle cat calling with a bit of wit or humour, maybe macam ni:
Just remember to not marah-marah because that's what they'd expect from you.
You're more likely to confuse or piss them off with your calm and cheerful responses. :)