Lots here needs clarification as it doesn’t make sense , if you were to be converted to FTTP but couldn’t be , because there is no FTTP in the area , then how did an order get raised in the first place ( it’s impossible for an ISP to raise an order if the Openreach system doesn’t show FTTP as available ) , if the OR system says FTTP is available but thats a mistake and it isn’t , did an Openreach engineer turn up on the date you were given by the ISP , and explained to you that the FTTP order must be a mistake ( that would be Openreach’s mistake saying something is available when it isn’t ) , if that’s the case the existing service shouldn’t get switched off unless the Openreach engineer, even though they tell you of the error , then books the job off as completed instead of incomplete, you don’t say if you were given an appointment or not , if an engineer turned up or not , if it was the engineer was who told you FTTP was available or not , or if the engineer disconnected your copper line or not , all this makes a difference when understanding what happened and what the potential solution could be.
FWIW , it does occasionally happen where the copper line is switched off in error for the same reason , the engineer books off as complete instead of incomplete ( usually when FTTP is available but a local issue like a blocked duct under the footpath stops the successful FTTP install rather than it being a mistake that FTTP was offered in the first place ) in those cases generally the copper service can’t be restored and whatever the issue is ( like a blocked duct ) has to be fixed and then FTTP is installed, so there a short while without any service copper or FTTP, but your circumstances don’t appear to be a small issue like a blocked duct
