By the way.. I'm here to let you guys know what to do if you are miscapped. Recently through my own experience of TMNet's crazy mood of purposely downgrading my 1Mbps link to 512Kbps, I've taken some steps that assured my restoration of speed. So here goes:

1) Make a report through 1300-88-9515
2) Call them once a day with the SAME report number that you initially got.
3) Call them till it's the 3rd *working* day.
4) Call them again on the 4th working day and tell them that you've just got "Suruhanjaya Komunikasi dan Multimedia Malaysia's" complain form and if the problem is not fixed by 7th day, you'll post it through POS-DAFTAR.
5) Continue to call them and also write e-mail to custcare@tm.net.my and tell them that you are going to complain to MCMC on the 7th day.
6) On the 7th day if they haven't fixed your problem(which I assure you, they will by now...) Go to http://www.mcmc.gov.my/consumer/complaint.asp and download the form, fill it in and send it to MCMC via POS-DAFTAR (for confirmation purpose).
7) MCMC will write a letter back to you within 3 working days. Scan this letter, attach it to custcare@tm.net.my and call 1300-88-9515 with the MCMC reference and let them know and tell them to update it to your report that you've complained to MCMC (it's part of MCMC's proceedure).

Finally..

Sit back. Continue to call them everyday.. be nice and talk to them nicely. Within 15 days, MCMC will call you and tell you that TMNet is going to send their technician the next working day + refund your lost of speed for that amount of time.. hehe! Personal experience!

Anyway, lesson to learn here is... Complaining at TMNet and LowYat do no good. If you *really* want to complain, go to MCMC!

>>> http://www.mcmc.gov.my <<<

p/s: As for me.. the technician came on a Sunday night and TMNet's senior engineer called me on the same night to confirm with me if my line have been upgraded to 1Mbps package. Took me about 1 month to get them to upgrade my line back + refund!