NEVER ever use Rentalcars - Greenmotion car rental company

We have used this service 3 times- twice was ok; but booking a car at Heathrow airport using car hire company Greenmotion was a nightmare. Hidden costs including paying more for insurance than the actual car hire, and then payng extra for a gps because the car gps 'chip'was dissabled...... and then car not inspected and a tyre with a slow puncture..... Disgusting!! And no feedback from rentalcars.....