Charge but don't deliver

I was struggling to find medication so I started phoning around. Optipharm were the only company who claimed to have the medication so I sent them a script and my medical aid details. A few hours later they phoned back to inform me that they in fact do NOT have any and that they will no longer be able to get any from the local supplier. A few days later I received a statement from my medical aid showing that Optipharm had charged me for the medication. When I queried this with Optipharm they said they are waiting for stock. So they charge their customers before they dispatch the medication. So I asked then to please reverse the transaction. A week later I receive another statement from my medical aid with a new transaction from Optipharm for the same amount and still no reversal of the first amount. So I queried it again with Optipharm. They denied ever processing a 2nd claim. A few hours later I receive an email from Optipharm apologising that there was in fact a 2nd transaction and that they have requested again for it to be reversed. My medical aid still can't confirm any of the reversals and they say that the claims are valid. Never do business with Optipharm.