It looks like the info from the line test is historic data - ie from prior to Dec 6th.
If it were me I'd ring them back and hope you get another agent. Zen have been expanding and taking on new staff, perhaps you were just unfortunate.
CS reps usually run a GEA Service Test. Quite often some of the info such as the line profile is out of date as will be indicated by the Time Stamp.
They really need to run an xDSL Status check which should give you your current sync speed, loop loss (atten) and Margin (SNRM), which is part of the KBD suite.
Problem being is Im not certain if it is available to LLU type ISPs or if it is strictly BTw.
I think what you need to ask for is one of the Brandenburg NGA tests.