Refund request

I am so frustrated. On Thursday I booked a bus on the computicket website and made payment. Payment went through but I did not receive confirmation so I was not sure if bus had been booked. I then contacted them and was advised that they could not see my booking. In the process I had to send so many documents and proof of my booking and they still said there was no booking and told me to rebook and repay and they would refund me my money when it clears. I rebooted and paid with them directly. Fast forward to getting to the bus only to find that the initially booking had actually gone through so there was no need to rebook. I have since sent so many emails requesting my refund even sent my bank statement showing the money coming out and they keep requesting more documents where as the error was on their side. I want my money back urgently