Hi mario3,
Thanks for reaching back out to us in our community and welcome back, sorry to hear you are getting scam calls, these type of calls actually call everyone regardless of which company they may call you at some point saying they are BT they don't generally have detail but try to fish for it, because most of these number are cloned there isn't a way to block them.
You can find out more around Spam and Phishing calls/ Emails here.
Kind regards
Paul.