The contract itself is a 17Mb/s contract
You are kidding yourself! There is no such thing as a fixed 17 Meg commitment (I could understand a 2 Meg contract but not that high). ISPs only estimate
speeds up to
However your line is capable of the full 24 Meg providing it is stable
which from the discons you are reporting it is not.
It looks like you are being banded by EE, see: Banded Profiles
(in the 6th band), possibly due to this instability. I've seen a lot of this banding about lately with EE and by perseverance it has been removed.
I don't think you will fare well in the Court unless you can show that your internal wiring is faultless. Have you tried running and getting your router stats from the hidden test socket within your master socket. (Could you please just copy your stats into your post; it is far easier for us to see?)
Why are you not using the EE/Orange Brightbox? It gives so much more info about errors, from which it seems you are suffering.
1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 20 Meg WBC