Was receiving poor download speed and BT decided to send out an engineer. I asked whether I should call and cancel the appointment if the problem resolved itself and was told no. Engineer arrived and the problem had resolved itself. BT engineer made a passing comment about a 3rd party extender we use for a games console but as the only device connected to this is a games console and not the two laptops (laptop always uses an Ethernet cable into the modem) it wasn’t an issue. Next month we receive an £85 bill stating that the engineer (not employed by BT but a company named qube) said that the extender was causing the problem. Spoke with BT who will not do anything stating that they can only go of the notes from a 3rd party engineer. Effectively being charged £85 for having a 3rd party booster in the house. Now told the only way to get a refund is to speak with this 3rd party company and have them change the notes? Although we have been given no contact details for them.