Payflex failure to refund my funds erroneously debited!

I have been a payflex customer for many years now and I have been using this method of payment on a regular basis. I attempted to purchase some items on Woolworths online using the payflex option. The funds were debited successfully from my bank account by payflex, however, due to an error on the Woolworths app, the order was not fulfilled. The funds that was debited from my bank account was never returned by payflex. I notified payflex support via email and to date I have not received any feedback despite their 72 hour feedback policy. I tried to contact them telephonically as well to no avail. I lost my money and no one at payflex even attempted to assist.