Disgusting service from Ampath Finance - embarrassment to Contact Centres

I received a phone call this morning from a debt collection agency advising that I owned money to Ampath dating back to December 2019 when my husband was in hospital. I phoned Ampath to find out about the debt as I have never received an invoice from them. I eventually managed to speak to a "person" who when I advised of the issue and that I needed an invoice and statement, said that she would not give me either until I gave a date for payment. I explained that I have no idea what the amount is etc. She was adamant - no statement. She said SMSs were sent which I never received as I keep all SMSs. How can I pay without knowing what I am paying for????? Also, as the invoice was apparently for December 2019, I can't claim on GAP insurance. I also asked her why I never received an invoice/statement during the 8 months since my husband was in hospital? She gave me a lame excuse about my number not being linked to the profile.. Never heard such drivel. I asked to speak to her manager and she cut me off. I called again and possibly got the same person as she cut me off again. Eventually I got a young man who sent the information to me.