I forgot my swimming bikini there when we checked ...

I forgot my swimming bikini there when we checked out. Called in the flowing day and a girl said they found them and will post to me. I couldn't remember my bank card number so had to call back to pay for the postage. Rang back a few days later, the one picking up the phone said will double check and give me a call back which I never get a phone call back. I called a couple of weeks later, a guy picked up the phone said the same thing that will call me back which I didn't hear back from him either. I had to call the fifth time, again said will call me back. Finally I've got a call back on the following day, however been told they can never find them anymore which there is nothing he can do. This is so ridiculous. Is there anyone take the responsibility looking after the customer? Is this the right attitude for a five star hotel? No one looking after the lost property? No compensation not even a proper apology? Really bad experience ever.