Together with my friends we rented a car from Enterprise in Glasgow International Airport. From day 1 we noticed a weird sound, and a couple days later a red signal in the board panel indicated "WARNING: Gearbox Failure Risk". At that time we were in Inverness and we brought the car to the office located at the airport. They told us to come back the following day as it was on a Sunday and their branch for damaged cars was closed. We came back next day and they said they could only give us an electric car for the day and we should call Glasgow airport office to get a (petrol) replacement car. We phoned countless times to the customer service number in the Glasgow office and spoke to many employees; all of them said the same thing, along the lines of: "leave it in my hands we will find a replacement car for you and we will contact to give you further instructions to get it"... none of them did anything and nobody ever contacted back, and we spend the whole day of Monday calling. In frustration we returned to the Inverness office on Tuesday, they kept saying that the problem and the responsibility was with the office in Glasgow and we should call them. We explained that we had been calling all day long with cero result. Only when we explained that we had lo leave our accommodation in Inverness and move on to our next accommodation in the isle of Skye, and that there were not easy access to charging stations for electric vehicles in the place we were heading to they accepted to provide us with a petrol replacement car, at 16:00 hr. The whole experience was frustrating, extremely unpleasant and we lost three days of our vacation doing nothing but fighting to get our car replaced. I will certainly never use this rental company again!!