FNB NO SERVICE NO MONEY

Over a month ago a transaction mistakenly went through three times on my card. The vendor voided the transaction on the 24th April. three weeks later FNB have still not refunded me. I have had to contact the call centre three times. The first TWO times I was given the incorrect information. The third time I was asked to fill in a form and wait five working days. I am now told that it takes seven days and I must just keep waiting. ITS BEEN NEARLY A MONTH ! This is ridiculous. FNB do not give a continental. It's not a lot of money, what on earth is the issue ! Are FNB so hard up they have to ***** customer's money ???