Travelstart will not respond to me for months!

I booked a ticket online in October 2015 for 5 people. I realised that the booking on a Mango flight was wrong, and I decided to call in to ask if I could change the time of the flight. The woman on the phone said that I would need to pay a certain amount to change details. We chatted about this for a few minutes, and I realised that mango will not do a refund. I could either change the flight time at an extra cost..or lose the money and cancel the booking. I decided I would just keep the booking. <br> A few minutes later I RECEIVED A CALL BACK FROM TRAVELSTART from the same woman I spoke to earlier, and she said that the credit card transaction didn't go through, and I should book another flight as my mango flights are not confirmed. I asked her if it's ok that I do a completely new booking, and she said yes. <br> I booked a flight again on kulula, and we boarded that flight and it was fine. But I have actually been billed by mango! And I paid for the flight which I wasn't on, even after travelstart consultant told me that I was not billed.<br> I queried the matter numerous times. They said they will look for the recorded phone call, and their IT dept. Would be checking.I just have to pay now