Sky broadband superfast - 5 days charge on bill

[Chacha_le_chat]

I've had a random addition to my bill Sky broadband superfast - 5 days. It's not been on any of my other bills and is not currently on my next predicted bill. This is in addition to my usual broadband charge. Our usage hasn't been out of the ordinary. Does anyone know what it could be? Searches and the sky chat bot have given me no answers. 

 

[caesarome]

If you haven't made any changes to your broadband package then it might be something to do with a discount ending so can you post the full shot of that bill but blank out your account number.