Is it definitely ‘slamming’ ?, as the ‘sorry to see you leave’ letter is an automated process , the common system all providers use generates the notification that a working line is involved, and obviously it’s in the losing providers interest to notify the soon to be ‘ex’ customer if it’s a case it’s a of slamming , as the option to cancel the transfer is highlighted in the letter.
With slamming ( or genuine migrations ) the line wouldn’t just go dead , you would get the new providers service delivered where the old providers service was, many genuinely slammed don’t notice until the initial bill from the new provider , or final bill from the losing provider turns up…..dialtone from company X sounds exactly the same as dialtone from company Y, and if the slamming request retained or ported the number then incoming calls are not affected either.
It sounds to me that you were not technically slammed , so no ‘sorry to see you leave’ letter would be sent….that’s not to say something has occurred that affected your service, it probably wasn’t slamming though…( slamming is where a new provider transfers you their company, without your consent ) , typically they call someone to get them to switch, and the punter says ‘let me think about it ‘ , the provider submits the request anyway, even though they never got an agreement.
If you lost service , as you suspect , by someone acting with malicious intent ,perhaps they simply called BT and asked for your service to cease, they would presumably have been able to answer security questions and have info like the account number etc to do this.
