CIMB promo, increased interest still remains at 2.50% p.a

Hi po, newbie lang po and I tried to open up account at CIMB for their February promo na may 15% p.a. Nag pasok narin ako ng 100k sa account ko this Feb pero yung interest rate 2.50% parin po when will it increase or may mali ba akong nagawa. Salamat po sa mga sasagot, tsaka ano papo marerecommend niyong digibanks na pwede tabihan ng pera kesa naman nakatambak sa traditional bank tas baba lang ng interest.