called about monitronics

Debt collector in Missouri calling for my deceased mother about student loans that she most likely co-signed.

Jason Cruz keeps calling from this number (314) 590-0880 saying he is with the law firm Rosenthal, Morgan & Thomas, Inc. and that our company has an outstanding alarm bill with their client "My Alarm Center" of past due $1,038.84 but total amount due is $5,886.76.... I asked him to send me a copy of the signed contract knowing full well we already use another company and invoices as i have never received one at all.  All he sent was his "Demand letter for payment due in full by today"......

I don't know this guy and have no alarm system. None of my debts are past due so there is no legal reason for this guy or his company to call me. Have blocked the number and will prosecute if these spams calls continue.

Did they report you to the credit bureau? Did it ever affect your credit score?