Which credit agency's file were you looking at?
Like most "credit" providers, BT reports to only some of the 3 agencies, I think it's Equifax for sure and possibly also Experian. I don't think they report to CallCredit.
Current connex, modem etc.:
Zyxel VMG8924-B10A VDSL2 modem/router & dual-line AAISP/Sipgate SIP modem
AAISP Home::1 80/20 150GB + copper pair on TTB backhaul (by request, Terabyte tariff when/if needed)
Sync 79987/20000 kbit/s, attainable ~94000/32000 kbit/s via 120-150m 1985 copper to ECI Cabinet 14, Milford Exchange (WMMFD)
& IPv6 (soon)
Wanadoo ~2Mb (Orange takeover) > Freedom2Surf ~4Mb (TalkTalk takeover) > Virgin Media 10->30->50->70Mb (excess connex) > BT Inf 2 80Mb (04/17 rises, no offer) > Virgin Media 100Mb (awful pings
) > AAISP 80Mb