Just got scammed at kollam railway station

I am a college student . While waiting for my train a 20-21 year old guy randomly appeared behind me and tapped my shoulder. First he asked for some water and then asked if I could give him 300 rupees and that he would gpay it to me. After I took the money out he said that he had lost his phone and needed to use my phone to call his brother (I should have walked away here but I am an introvert and didn't want to be rude.when he called his brother he said he would send the money within 20mins. After that he immediately left saying he had to catch the bus to see his mother who had cancer(Again there were a lot of red flags but I just couldn't bring myself to say anything against it). Even after waiting for a lot of hours I haven't yet received my money.His brother is also not picking up any calls.