"wrong address"

my wife had to receive 2nd scan appointment and we did not receive it, so i called hospital and they told me the address was somewhere else. then i asked them to confirm if this is mixed with someone else, without confirming they updated the address with mine. and then when i got the letter the postcode was again wrong, thanks to post service they posted. i called again and asked for the address to be checked, staff member was very rude, and then they said address is correct but postcode is wrong, how on earth someone change address and leave postcode as it is. so our important appointments were going somewhere else. these guys needs to pay attention to these mistakes. i am very concerned about critical mistakes, that should not happen.