Car great but service at check in not so good

We waited around 30/40 minuties in the collection que for our vehicle, service seemed really really slow for each customer even though there were two members of staff dealing with customers and a third behind a computer. When it eventually came to our turn, we were told about the deposit if £1950 to put onto a credit card this was fine as we had taken out our own damage waiver Insurance. The staff member asked if we wanted to upgrade so £0 deposit on a credit card when we said no thankyou she seemed quite shocked and checked we were sure. We had booked a group c vehicle c4 cactus or similar, we were given paperwork to sign for a vw polo when we questioned this and asked is that not smaller will we fit, we were told yes you will be fine there is only three if you. We said we would go see the car and see if the size was enough for us as we just wanted to get on our way after a long wait. We walked away and decided to look online, seeing that a vw polo is smaller and is group b vehicle we returned to the desk again and joined the que after a few minutes the lady that had served us noticed we were back and approached us we explained about the different group and that we would just like the car we booked and paid for in the same group. We waited again and after a few phone calls we were then allocated a Hyundai i30 and so went to collect that. While waiting for the car to arrive we saw the couple before us who had still not left either they were on there third car the first one had an issue (can’t remember what) and the second one had a flat tyre they had been told it’s fine just take the car and you can get the tyre blown back up. Why would any customer just landed for there holiday want to do that?? And what if it couldn’t simply be blown up? This demonstrates really poor customer service. At the desk when we asked about getting the polo we were told there are no c4 cactus we’ll surely then you should upgrade us if you don’t have what we purchased not downgrade

Booking was fine and easy to do