Took my money back

Two days ago, I paid for something on itunes and then a couple of minutes later I cancelled my subscription. Then I called the bank and asked them to please reverse my transaction. They happilly did so. I recieved and Sms to say that my money (R1249.99) was put back into my account. And then I got my money back into my account. After spending money with my friends I had an amount of R639.86. Today I went to buy some soda and when I got to the till. To my luck my card was declined. And I was under the impression maybe the system is offline. Then I went on my phone to check maybe the problem is on my side. When I logged into my cellphone banking. My balance was minus R654.91. So iTunes went and subtracted that money from my account after I went and reversed my transaction within 10 minutes. And cancelled my subscription. And as you can see the money that was paid back and that was taken again isn’t showing on my statement.