Exploiting clients with the interest rate 50%

On the 30 dec 2021 i took a loan of 8000 with a mnthly installment of 3200 for 4 mnths. Today, 14 days later the settlement is 12048.44 which means i pay 50% interest for a loan that is only 14 DAYS. Why must i pay the full amount that i was going to pay in 4 mnths meanwhile the loan is only 14 days old.