To me, SKMM, is like just wayang kulit.
Ask anyone who has dealt with SKMM about coverage, they will say, SKMM will pass the buck back to telco.
And telco will say - Its normal, no issue, blah blah blah. And case close.

They are unlike Singapore's IMDA, the equavalent of MCMC but even stricter. Dont play play.
Thats why, the coverage in Singapore is up to 98%. Of course they can do it because they dont have rural areas but still the telco strive to achieve a target.

I think its best you move on, no point crying over spilled milk.
Maxis is holding you at randsom. Just move on , and learn your lesson from there.