Hi,
BT have now acknowledged a fault with the BT broadband usage monitor.
I am prevented from posting a link to the thread. It is on the BT Community forum under a thread entitled "Broadband Usage Massive Surge" (see page 10 of the thread - post by PaddyB from BT on 24th July 2014 at 13:37 admitting the fault).
BT were incorrectly allocating any BT WiFi FON (i.e. hot spot) usage through BT home hubs to the BT broadband customers who owned the home hubs. As a consequence, BT broadband customers were being charged for excess usage, and/or forced into accepting upgrade packages in an attempt to avoid the excess usage charges.
BT have only just identified this fault and billing error. BT have not provided any reasonable explanation for the fault, nor any statement as to why they believe that only a 'very small number of customers' were affected. BT merely state that it was caused by an 'accounting process'. We do not know how many times this has happened before, nor how many customers have suffered a financial loss as a consequence of the fault.
Any broadband excess usage charges and/or unnecessary upgrade costs (or other financial loss) incurred as a consequence of this fault should be claimed from BT.