We regret leaving Discovery Health for Momentum Health

We phoned Momentum Health for a authorisation number for our daughter's immunisations, which we received. A week or two later she had them done at a clinic which doesn't handle claims and we paid for them ourselves, after which we got a statement (showing that we paid them) and we sent a claim to Momentum Health with the authorisation number and the statement from the Hospital. First, they denied the claim saying that the authorisation number did not exist. My husband sent it in again and got no response, after which he phoned them and the authorisation number was indeed on their system. Then they took the money from our savings account, even though it's covered by the medical aid fund and not the savings account, and paid the money to the hospital, even though the statement showed that it was paid. Now we have to send them proof that we paid it, again EVEN THOUGH THE STATEMENT SHOWS IT IS PAID. I had such a lovely experience at Discovery and this is just really disappointing to be honest. The only reason we left was because my husband's new job deals with Momentum and asked him to move over and we really regret it. They never once made a mistake with a claim, and they even allowed me to deal with the admin on behalf of my husband. I can't believe one single claim is causing us so much grief, it's as if Momentum has no experience in this area.