Yar, I suspect most GLC use the same grade classification, my firend from Singtel say is the same. Dio stuck at M2 is very common, I think M3 is the default retirement rank for GLC, i.e. for most people who stay there for very long, you will likely get your M3 in your late 40s / early 50s.

That’s why I left cauz I’m only 39 this year and got no intention to get stuck for rest of my career there with no increment because hit max already.