Is this how you think about your customers

I booked my car for worn brakepads & repair of seatbelt but I was told that they have to order a part & as their rules they cannot order the part if I don't leave the car overnight as some customer let them order the parts & don't bring the car back, what load of crab is that for providing a good customer services, I have to be unduly and unjustifiable inconvenienced bcos their policy is that they order only if the car stay with them overnight, I will only understand if the car was stripped & not drivable or safe to drive,this attitude is an indication that customers are taken for granted & not actually cared for, a pure inconsiderate. In addition I am not their new customer, I've been there on many occasions, the seatbelt it also an issue of paramount safety to me that's why I said they must check it & in no way I will let them to order the part & not return, the least they could do is to take a holding fee from me & refund it when I bring the car if this is a big concern to then than just indiscriminately inconvenient everyone, I had to take the matter with the dealer principal b4 I cud be accommodate, if that how their service centre see their customer they must just close shop.