Have you just moved into the property so don’t know who ( if anyone ) was supplying the previous broadband service , ( it may not have been Openreach ) or have you lived in the property for a while but were using a non Openreach based supplier , in these cases , there could be various reasons for service not simply starting to work on the date you were given , the simplest reason may be that you may not be connected to the correct Openreach socket ( if the address has more than one Openreach socket ) , or the ‘line’ from the address to cabinet ( assuming you are taking FTTC ) has in the period between now and when it was last in service ( which may have been years ago ) is no longer intact .
As stated lines that are started in these circumstances ( a gap of many months or even years since the line last delivered service ) should be dealt with as early life failure, if they don’t simply start back up .
https://www.bt.com/help/broadband/fix-a-problem/broadband-and-wi-fi/what-do-the-lights-on-my-bt-hub-...
It is only really if you had service working service already from one Openreach provider and migrating to BT that there is overwhelming expectation that it’s not going to be problematic , so what’s your ‘story’ , is this your first service with an Openreach based product at this address , or there has been a big gap between now and the last time you had Openreach service , or the line was working up until very recently for you with another provider and it’s only the change to BT that has affected this .
Whilst this won't get your broadband fixed any quicker, are you aware that most mobile phones can be set up as a WiFi hotspot to keep you going as your "work depens on it"?
Do you have a mobile phone, (Android or iPhone), and what is your data allowance per month?
Do you get a reasonable signal strength from the mobile mast?
Did you manage to get BT to task Openreach to sort out your connection?
Sounds promising.
Please update this thread with the result, hopefully they can sort out the issue.
Its not 6pm yet.
Once it gets past that time, ring BT and find out what is going on.
See https://www.bt.com/help/account-and-billing/automatic-compensation
See my edited post. Give BT a call to find out what is going on.