You haven’t received your internet plan’s maximum speeds

[ASJ666]

I get told I can down grade from a Standard Plus plan to a Standard plan.
Means I go from 50 Mbps to 25Mbps at peak times.
Or does it?
No idea, there is no description about if you are getting better than the 25Mbps at present if you keep that or by going to a slower plan I would be "throttled" back to a max of 25Mbps or during peak/congestion that I would be more likely to be "throttled" back.
Under the FAQ's on https://www.telstra.com.au/consumer-advice/mynbnspeed  under 'What happens if I move to a lower nbn service plan?'
There is no information at all about impacts to data speeds if I do choose to do this.
Do I just go to slower plan and get the refund?  
Then if I get issues look for a another plan at a better cost?

[cf4 · Accepted solution]

I received the same letter and because my speed is only 4 Mbps slower than the plan speed (46 Mbps actual / 50 Mbps plan) will be sticking with my current plan which also gives unlimited data compared to 200 GB on the 25 Mbps plan. Your email should have told you what your current download speed is. If you have an FTTN or FTTB you can check the speed in the modem. The location of the  information depends on the modem . Here is were you will find it on the Telstra modems.

Telstra Gateway Max TG799 and Telstra Gateway Max II (TG800)
http://10.0.0.138 > advance > broadband > DSL stats

Telstra Gateway Frontier (DJN2130), Telstra Smart Modem (DJA0230) Telstra Smart Modem Gen2 (DJA0231)
http://192.168.0.1 > Advanced > Broadband > DSL stats Log in ID Gen 2 is admin/Telstra

Telstra Smart Modem Gen2 (LH1000)
http://192.168.0.1 > Broadband Log in ID Gen 2 is admin/Telstra (Only DSL RX rate and DSL TX rate available).

Telstra Gateway (Sagemcom F@st 5355)
http://10.0.0.138 > Advanced > Gateway Settings > Dev Info > General > xDSL (Near bottom of page) Password is admin

If you move to the lower speed plan you will not be throttled to 25 Mbps. During peak periods you will not be throttled to less than 25 Mbps in peak periods but you might get less than 25 Mbps if there is  congestion. 

[ASJ666]

So within 30 minutes of opting for the slower plan my modem stopped working, I turned it off and on.

Now my max speeds are the standard plan plan max speeds!! :-(

So the comment above is not accurate.
"If you move to the lower speed plan you will not be throttled to 25 Mbps. During peak periods you will not be throttled to less than 25 Mbps in peak periods but you might get less than 25 Mbps if there is  congestion. "

Please don't give this inaccurate advise to anyone else.

It was immediately slowed down.

Once I'm made redundant from the Big T, I will not be using them for my telecommunications I have never been given accurate advice or service worth having.

[cf4]

Sorry I missed inserted a less than  between to and 25 Mbps. I meant to say.

If you move to the lower speed plan you will not be throttled to "25 less than" Mbps

I thought it was fairly obvious if you were paying for 25 Mbps you would not get more than 25 Mbps and you were worried you would throttled to less than 25 Mbps during peak periods.

Sorry for the confusion.