Happy Days Day Nursery

We registered for the settling in sessions. They said no sessions can be booked without paying the refundable deposit.
It is mentioned in their contract (that I signed) that the settling in sessions are free. After sending my daughter for 3 one-hour long settling in sessions, I realised the nursery wasn't what I wanted for my daughter. We didn't go ahead with the place.
They never returned the deposit. They have denied the same. Why did I not want this nursery?

I visited them 4 times in total, show around and then 3 settling in sessions, I wasn't introduced to any of the staff members, except for the one who showed us around. I asked about the key worker who would work with my child, I was never introduced to them. There was no learning schedule discussed, no information about the development updates and/or observations about the child. My child wasn't even addressed by her name for the first settling in session. On the second day, they asked me what's she called. Weird!