why not go for a part time degree?  Employers will usually look at degree first, experience later in deciding your salary range.

Where are you working atm?  Choose somewhere near your workplace if you can't do it full time. 
MMU grads are in high demand in IT, it seems...
You're right. but in IT, that's usually the case.  I'm in IT Infrastructure as well, so I can roughly guess what employers look for.
nowadays, degree is also not enough as there are tons of degree holders in the market.  they will look for ppl with CCNA, MCSE, ITIL certs, in addition to an IT degree.

i think you are underpaid as a spm leaver with the right connections can garner 1.5k

IT support roles is not high.. with 2 year experience and degree maybe around 3.5k in KL?  so your company is in Melaka, maybe a bit lower, maybe 2.8-3k? 

I would suggest you doing part time in MMU, you can travel back and forth between melaka and KL for weekend classes.

im no expert but your salary is not proportional to your workload.

its very hard to guess because you dont have the proper qualifications.

remember
the sooner you do it,the better.