My wife and I hired a car from Goldcar for 3 days from Malaga airport.

On day 2 the car broke down and I called their helpline. This was a recorded message and asked me to leave my number and they would return my call. I received no call that evening so the next morning I called them and managed to speak to someone.
They then arranged for a truck to collect the car from Benahavis. I then spoke to the main office and they informed me that they could not get a new car over to me and that if I took a taxi to the airport that they would pay for it and arrange another car.
When I arrived at the airport in the taxi and asked the Goldcar reps to pay the taxi fare, they refused. This resulted in a stalemate as I also refused to pay as they had verbally agreed to pay for the taxi during the telephone conversations. The police were called (by myself) and a heated debate over who was to pay followed. In the end I paid and the police told me that I would need to claim the money off Goldcar on my return to the UK.
This is proving to be impossible as they are very unhelpful: when I call the main office in Valencia they said that they cannot reach the Malaga office on the phone as they are so busy! I called the Malaga office and they said that I need to email customer services (no telephone number!). I have emailed and received no reply.

I guess I may need to consider legal action to recover the 100 Euro taxi fare.