Dear all, the story goes like this:

I've been noticing my home fibre connection having issue for the past few weeks, the ping always spike to 300-400ms every after few seconds, constant packet loss, and highly inconsistent internet connection speed. My current package is 300mbps package, download speed reaching below 100 mbps, as for the upload speed is even more ridiculous, under 10mbps, which suppose to be above 50mbps. I've already lodged a few complaints to Maxis for the past few weeks, they had came to my place and replaced a new router for me, but the problem still persists and they are still investigating the problem, which is absolutely frustrating because I've been using deteriorated connectivity for the past 3 weeks! I unable to play games, stream Youtube smoothly and etc yet I still have to pay full amount of bill.

Now suddenly I realized few weeks ago I received multiple phone call claimed they are calling from TM and would like to check if I am interested in porting out from my current Maxis Fibre plan to UniFi, since I'm still being bounded by Maxis Fibre contract, I rejected the offer without any further enquires. Few days after the phone call, I started having this slow connectivity issue, which makes me wonder if it is possible TM is sabotaging my line? Since to my knowledge Maxis is using the TM's fibre infrastructure.

Maxis also been very slow to resolve my issue, always telling me they are still investigating the issue, I've had enough with them and decided to lodge a complain to MCMC, anyone have any idea how can I do that?

I tried to ping and do the speedtest using both cable and WiFi, both having the same result.
Furthermore, my PS4 is connected to my Router via Ethernet Cable, I've been consistently getting packet loss from all the multiplayer games, god damn frustrating   

I'm staying highrise, highly likely the issue is caused by congested bandwidth from their part, I noticed the slow connectivity issue is more prominent during peak hour.

But I thought the responsibility of maintaining network cable should lies on network provider instead of condo/apartment management right?

Glad you solved your problem bro, I think ping spikes is normal when you are using 2.4ghz connection, connect to your 5ghz wifi or if possible try to use lan cable for best connectivity.
I see, I think most probably TM also doing something behind the scene. But I have to say, from my experience, UniFi have much better network stability and consistency compare to Maxis. If I have to choose again, I will opted out Maxis Fibre, But TIME fibre still the best.