Loan shark more afraid of you than you of them, becos they are illegal. If caught, 5 years, $50,000 fine and 6 strokes. The people who do harassment are debtors, ordinary folks you, who were duped into doing their work in the hope that they will not be harassed or that their family will not find out. In the end sure get caught becos of 100,000 police cameras in Singapore. DO NOT give your ATM card to Loan Sharks. Sure get caught and high possibility of jail term.
Business model of Loan sharks IS NOT lend u money and earn interest. They make money by blackmail and harassment to squeeze money from you. Meaning, u no borrow also say u borrow and even $500 loan can squeeze you to give $10,000 as long as you can beg and borrow from friends and relatives to give to them.
How to deal with them :
1) make police report at the nearest police post to your hse with their threatening msgs as proof. ask police to patrol your block more frequently
2) change phone nbr if possible, if not, do not take their calls or open their watsapp msgs. DO NOT communicate with them.
3) tell the people staying in your hse that you are a VICTIM, who had foolishly borrowed from loan sharks and regret your actions and will change over a new leaf. Warn them that they (and/or your neighbours) make receive threatening phone calls or letters. Ignore such communication becos these are empty threats.
If you borrowed becos of gambling problem or lifestyle issues, seek help. I personally am a volunteer at One Hope Center, a non-profit Public Charity, that helps gambling addicts (through counselling). All activities at OHC, including counselling sessions, are free. There are other such organisations like Adullam, Blessed Grace, but not sure whether there is need to pay anything