DON'T BUY ONLINE WITH YOUR FNB DEBIT CARD

I recently paid my Google add with my FNB Platinum Cheque Debit Card and after approved, the fund was deducted from my card after I confirmed with a Y on sms, 5 minutes later, I see on my Google account that they state the payment failed. Then I contacted FNB as that money is not back in my account and it's R4,500, so they state I must fill in a dispute form and it will take 2 to 3 working days before the money is back in my account. I filled in the form, but my situation is not under their options and I have to agree to be charged R250 for if they find it's my fault. I can't see how it would by my fault if the networks made my payment approved and then failed again. I contacted Google and asked them to release my funds, so they state it's FNB that holds my money. After I send my dispute form with additional information I added on the form, they contacted me after 2 days and told me I can't amend the form I have to send in the form without any amendments, wow and wait another 2 to 3 working days. That happened on the 24th of August at 08:00 and we are now already 5 days away and still have not been refunded my money. WHERE'S MY MONEY!!!