I just read the first page, and scanned the second.
I cant beleive this has gone on for so long! I bet if most were to look at the kit being sold with aquariums these days, its the bare minimum to pass, or just below. I see in in small stores, and at chain stores.
As TOS, BA and others have said, at best you can moan and see what you get, if you get nothing, you get nothing. You, on your own, are not going to pin a multi nation multi-million pound corporate to the wall with claims that your PF10 isnt big enough for your tank. They wont care and you'll probably get an apology and a voucher at best. If you dont like what they have supplied with the kit, either take the whole kit back, or buy a new filter/add a small powerhead.
Apologies if it sounds harsh, it isnt meant to. Its a harsh world.