Bad technology integration between Europcar and booking.com

I was actually going to award EuropCar with a single star, but Emma from the head office came to my rescue. My car rental booking went wrong as a voucher was generated via booking.com's platform and I had to make an alternative plan which ended up costing me more than I had budgeted. To make matters worse Europ car didnt return the deposit. I had to call in and ask almost 5 days later to ask for my refund. Emma sorted it out for me. What seems to be the issue here is a failed technology integration between europcar and booking.com.

This needs to be sorted out before it continues to affect more customers