Handed over with no notice

I received an sms from Pathcare on the 20th of December 2017 stating that my account reflects a balance of R190.00. I called once i returned to work yesterday on the number provided on the sms and spoke to Jamie Lee Hartzenberg. She informed me that i am owing R190.00, she sent me the invoice which i acknowledge and paid yesterday with my internet banking.(Ref F ********** ). She told me that another amount has been handed over to Vericredit.(Ref F ********** ) I told Jamie Lee how can my account be handed over if i never received a phone call, email, letter or sms stating that anything is owed? The only and the first sms i received from Pathcare was on the 20th of December 2017 about R190.00 owing. It is absolutely unacceptable that my account has been handed over without even one notice, letter, email, sms. Nothing. I will pay as soon as i have received a tax invoice stating what is owing (F ********** )