Frustrated

I made an online purchase and selected to pay with payfast. While i was busy entering my online banking details on the website the page expired so i had to redo the whole transaction. I did another transaction only to realise later that there money was deducted twice from my bank account. I sent a query to payfast and still waiting for a reply. I need my 2500 back. It surely cannot be the case that it has gone down the drain. So frustrated right now!!