NEED ADVISE WHAT TO DO?

MY INLAWS BORROWED FROM ME A HUGE AMOUNT LET SAY 2.5M. WE PUT IN WRITTING AND NOTARIZE, THE CONTRACT IS PROMISSORY NOTE STATING THE PRINCIPAL AMOUNT AND THE INTEREST.GIVEN 5 MONTHS TERM TO PAY THE AMOUNT, IF NOT PAID IN FULL SUCEEDING MONTHS WILL PENALIZE OF ADDITIONAL 5% INTEREST. ITS BEEN A YEAR THEY DIDNOT COMPLY OR PAY THE DEBTS, THEY SAID MAGDEMANDAHAN NA LANG KAMI. ALL MY SAVINGS I TRUSTED TO THEM, PERO WINALANGHIYA NILA AKO. HINDI NILA AKO TINURING NA PAMILYA.
ANUNG PEDE KONG I KASO SA KANILA, WHAT TO DO?HOW?I WANT MY MONEY BACK AND THE DAMAGE THEY CAUSE TO ME. PANU AKO MAKAKAKUHA O MABABAYARAN NILA NA MAPIPILITAN TALAGA SILANG MAGBAYAD.

PLEASE HELP ME...HOPE YOU REPLY.THANKS