Appalling and utter lack of service

I had blood tests done on the 17th of January 2020 and my medical aid settled the account of R386.70 on 27 January 2020. Months later the accounts department of Pathcare emailed me to say that this account was unpaid. I sent them email confirmation from my brokers, my medical aid as well as my remittance advice and monthly statement that I receive from my medical aid. I can see on my remittance advice from my medical aid that they tried to claim it twice but it was rejected as a duplication code 23 " This is a duplicate line which has been previously processed". Exact dates, codes, doctor and amount. Despite emails back and forth they refused to acknowledge that the account had been paid. They then handed me over to their bad debts department and then to their attorneys for collection. They are now totally ignoring all my emails asking for an explanation from four staff members. The only response to my many emails is a lady from the attorney's to say I have not been blacklisted. A sms message was also sent from their attorneys to my ex-husband's cell number. This is a total breech of patient confidentiality and privacy.