Pathetic service

Following hospitalising Momentum health paid of portion of the claims according to my medical aid. I was made aware by the treating doctor that momentum did not pay thier account but rather paid to my account. I called momentum to query this and I was made aware that the amount was paid to an old bank account that I used to own. I then told the consultant that the account was closed so there is no way that they should have paid into that account . He continued to argue and was fully convinced that the amount was paid into thar account. I then asked as to why was the amount paid into that account without confirming with me. He said it was my responsibility to change my bank account on my profile because they authorize payments into the account active on my profile. I asked to speak to a manager and according to him, managers don't take calls as they have other matters to attend to however he can load a query for the manager to call me which can take upto 48 hours. I didn't mind and asked him to do that. He asked me to hold the line while he loads a query to speak to a manager. On his return, he then told me that he walked to one of the manager and that the best solution is to go to the bank and get proof that account is closed. What a pathetic service I have gotten from Momentum and I'm considering moving to a competitor. How they paid money into an account without confirming the account with the account holder? I work for a financial institution and deal with payments everyday and this is unheard of