Failing to Identify the issue but I should pay the cost of towing

I never had bad experience with car dealer like Hyndai Midrand at 16th Road, My Hyundai Grand i10 is still under warranty. Over the weekend it was not starting until I called Road site Assist to Tow the Car to Dealership ( Hyundai Midrand) Today they called and said they cannot find anything wrong with the car and it start but I have to pay the cost of Towing . I asked why because I am sure something is wrong and if they cannot find the problem why should I pay for towing. I have towing company receipt which they tested the car before Towing and indicate on the receipt that it failing to start. I escalated to the Branch manager (Brain) who failed to assist and insisting there is no problem on the car but I have to pay towing costs

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