Bad service and poor internet connectivity.

I have had a outstanding query regarding exceptional slow and intermittent connectivity since 27 March 2021. I have emailed and phoned continuously on a daily basis to try and get this problem resolved. When I finally get through, they say it has been escalated to TT Connect and they will get back to me with a status update. To date I still have not received a status update. This problem still exists to the extent that it is severely impacting on my business. Service quality and connectivity is very poor.