Begging for money for a flight ticket back home or otherwise shouldn’t be allowed as it implies you broke the law.
Entering Taiwan on a tourist visa without a return ticket is not allowed. Usually the airlines are enforcing those rules when you check in to your flight to Taiwan. Border agents also might ask to see the return ticket (usually they don’t). You can simply circumvent it by buying a return ticket that is 100% refundable for a short period of time and refund it after you enter the country.
I would call the police. People who are in this situation are supposed to contact their country’s representative office for assistance instead of begging on the streets.