Hello guys, currently I'm subscribing streamyx 4mbps with RM140 per month and the 1 year contract already ended long time ago. I heard there is a promotion speed upgrade form 4 mbps to 8 mbps with the same price by renewing the contract to 2 years. Therefore, I went to TM point asked for it, the officer told me that my living area don't support 8mbps since the wire still using copper and the maximum speed for my living area only 4 mbps and there are still no fiber optic support. The officer also told me that if I really want to upgrade the speed to 8 mbps, she can do it for me via their system but the speed may not stable and I may easily get disconnect. My question is should I upgrade my internet speed to 8 mbps or stick with the old package? Here are my ADSL detail:

Upstream Power 9.0 dBm
Downstream Power 12.0 dBm
Adsl Line Status SHOWTIME.L0
Adsl Mode G992.5
Up Stream 511 kbps
Down Stream 5119 kbps
Attainable Up Stream 1279 kbps
Attainable Down Stream 21884 kbps
Attenuation Down Stream 18
Attenuation Up Stream 7
SNR Margin Down Stream 29.4
SNR Margin Up Stream 25.3