There are 2 contact numbers and addresses of authorized Apple service providers in Singapore:

-Apple Marina Bay Sands

2 Bayfront Avenue, B2-06 Singapore

Phone: 1800 407 4949

-Apple Orchard Road

270 Orchard Road Singapura

Phone: 1800 699 2824

There are two other official Apple services like ALAB or QCD but it is better to go to an independent Apple repair. Because you will get more value for money and professional options from us :)