Rejected increase CL request

Hello! Any insights or possible reason why my request for increasing my CL was denied?

For anyone who might ask, I always pay my outstanding balance in full on or before the due date, I never missed it. Most of the time 5 digits din ang outstanding na binabayaran ko.

Been a CC holder for going 3 years now and never na increasan yung CL. Though 6 digits naman ang CL pero I was just wondering kung bakit na deny. Thanks!