I don't know this person!!!

"Good day, please note that this call may be recorded for quality purposes"

"You're recording? Excellent. Because I'm recording too. Please note, since this is the 10th time you're calling me about an account that belongs to someone I've never heard of before, this recording will serve as evidence for the harassment charge I'll be filing with the police and discussions with my attorneys to prepare for a damages..."

"Hello, hello, are you still there...?"

MBD will stop calling you about accounts you know nothing about. Worked for me.