Booked a car for our Spain trip via rentalcars, paid everything upfront. The staff at pick-up and drop-off were super friendly, which was a good start. But then, surprise! An invoice for 300 euros shows up after we get back home. Tried calling customer service, but it was like trying to reach a ghost. Emailed them, but no dice there either. Finally got through to someone after a 15-minute wait. The person on the line was really helpful and promised the refund is on its way. Fingers crossed this gets sorted soon. Overall, a bit of a hassle, but the staff was nice when you could actually reach them.