When I first got it, it was better than ADSL2,
MY ADSL was 5mbs
My brand new NBN was ariund 15mbs.
But 12 months on and Im getting 6mbs
So I complained
You knowvwhat telsrra told me.
" more people are coming on line so it will slow down the service"
So I asked if there was some way to speed it up, they said.
" you can go onto a larger plan or turbo boost your plan"
So there you have it
Once they have you, they gradually reduce you speed until you get annoyed enough to go onto a more expensive plan.
seems like there is a bit of misunderstanding here...
the large plan and 'turbo boost' (telstra speed increase nomenclature) would only be effective if there was no congestion on your line to begin with... you could originally be on a 25 plan and be capped at 25 (theoretically), but then move up to a 50 plan, which would then be capped at 50, not 25... this is assuming no congestion.
if you had congestion, then increasing speed on your plan would have little effect. for example, i am on a 100/40 plan, but normally get about 67, but sometimes this drops to around 50 in peak times (not always, but sometimes). moving to a '120' plan (if it existed) would have no effect...
the two things being mentioned in the same conversation (speed boost and congestion) is a bit misleading... which doesn't help your situation...
only the ISP purchasing more CVC from NBN for your area would make a real difference to congestion... (as long as the physical infrastructure was in good condition, which if not, would also have a marked effect on performance). think of purchasing CVC as buying a bigger pipe for internet traffic...
the ISP's having to purchase CVC from the NBN is one of the real reasons that congestion even happens in the first place. other pricing models around the world don't use this pricing model...