I took a National Cab from Hobby Airport to the Medical Center. Flat rate of $27 was posted at airport, but cabbie charged me $40. I also found out he took a route that added 4 miles to the drive. I called the cab company 3 times in 24 hours to get a refund, but the company just kept telling me that they could get a hold of the cabbie. Avoid this cab company.
Cons: Overcharged, took addition 4 miles to get to destination, did not honor airport rates
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