Share with u my experience. Hopefully I won't type too much
Years ago when I was on the 4mbps package, my speed dropped to 2000+ kbps. Dialed 100 and complained, no use. Went to TM Point and complained...also no effect. According to them, all was normal. And my speed was stuck unwaveringly at 2000+kbps.
Got fedup. Made a printscreen of my modem stats, printed out hardcopies, and put a copy onto a pen drive. Went to the TM technical dept, registered at the guardhouse, left my IC with the guard and went to see the head of the dept. I politely explained my problem, gave him the hardcopy and he transferred the jpg file from my pen drive to his pc from my pen drive.
The head of the tech dept was quite a pleasant fellow. He pulled out a clipboard and showed me all the other complaints he had from the streamyx users on my street. And then he explained there was a power cable problem; the fluctuations in the electricity supply was causing problems and had also probably damaged the DSLAM in my area. Not enough power and/or damage had caused it to fallback to a lower speed. He then asked me to be patient for a week and they would try to fix it ASAP. I thanked him, shook his hand and left.
On the following day I saw ppl digging out the cables that ran to the DSLAM and putting in new red plastic pipes. The next day I saw a technician fiddling with the internals of the DSLAM, and that evening my speed was back to a proper 5000+kbps for my 4 meg package.
Hopefully you won't have to go thru what I had to do. I'm no techie, but maybe since they say the cable problem is fixed, you could call 100 and ask them to reset your port and/or check that you are properly capped. Dunno if the DSLAM box serving you is still "stuck" at the lower speed, and has to be told that it's ok to resume normal bandwidth? Good luck!
I had this issue even on my old house... My upload speed was cap on 5Kbps and 2mbps download. The operator didn't seem to understand what is the issue, I had to email a few time and finally I just made a complain using the newspaper hotline. It was fix with in the week after coming out on the newspaper lol
But yes, directly going to the technical department sounds much better then speaking with the operator who are replying based on ready made script.