Nope they miss guided you, The device can only fall back to Rev A 3.1mbps. At least this is what I understood after reading the details on ptcl website.
BTW it looks like you are always in Rev A bandwidth, can you confirm if you area is under 4G coverage of PTCL? Try testing it somewhere else maybe?
I've seen some very worse times with my nitro cloud but it was always above 4/5mbps when speed tested at Rev B, distortion and jitter kills these devices actually.
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