from your recent stats you are on infinity 1
Well that's what I thought. It's just the conflicting information on the BT site.
Here are two screen shots showing what I mean.
from the btspeedtester results you previously posted your up profile is 20mb suggesting you are on infinity 2. your max estimated speed from dslchecker is about 34mb so there is no point in changing your package as you can't get any faster
The packages have had a rebranding as follows
Unlimited Infinity 2 - the usual up to 76Mb
Unlimited Infinity - up to 52Mb
Infinity - up to 52Mb with 30GB download limit.
This is probably as a result of the 30GB package being called Infinity 1 for a while with the old Infinity 1 referred to as Unlimited at that time - somewhat confusing.
Not sure about that one, I know that infinity '1' used to be limited speed but every one got a free automatic upgrade to 52Mb. Your chances of finding out what's gone wrong here are remote IMHO !