Double billed for 5 months

Hi All,

I'm struggling to figure out how to proceed with this issue.

Story is, had ADSL, upgraded to Fibre, BT billing for both but providing 1 service. 

I have called 3 times, submitted compaints twice and online chatted twice, promised to be credited and to fix the issue, but it never gets resolved. 

I don't want to cancel the DD as they will cut the business broadband off, the only step I can think of is to report BT to someone 🤷🏼‍♂️

Any help would be appreciated. 

Thanks