Very bad experience front desk experience! Never e...

Very bad experience front desk experience! Never experienced this in my many business travels.
I had a reservation for 4 nights and I was given a room with guests already occupying the rooms and on two occasions I was able to use the key to open.
This happened on Manager's watch so I think there is something fishy going on in this hotel!
On the third time they given me a room with jumbled room number written on the piece of paper so that I went down again to be corrected! Above that they did not really apologize with the big messed up and inconvenience to the guest.