Ampath, get your accounts in order, please! ***

My mother who is 74 years of age, went in for a procedure in 2018. To date they have been bugging us for payment. We had made and arrangement to pay them off. The final amount has been paid at the end of March 2019. She keeps on receiving threats of legal action on SMS, in caps, mind you. When I call the number of their "attorneys" ***, they pick up the phone and then immediately put it down. Am I perhaps interrupting their permanent lunch? I have sent them proof that we have made payments, as per the arrangement. If they want us to pay for unnecessary legal fees, they can forget about it. Also, what are they trying to accomplish? My mother is 74. She can no longer apply for any type of loans anyway, so to who's benefit will it be to blacklist her? Just wondering? Any feedback from either Ampath or Vericred will be appreciated.