I don't know about *worst* service, but it's definitely on my bottom 10 list. The following is taken in part from my letter of complaint.
I went to stay in Halifax for business, and picked out the Prince George hotel from the list of conference hotels. My flight was delayed, and I flew in about 11pm - which was a problem, as the airporter doesn't run at that hour. Picture a large group of people, all waiting for the very few taxis which would appear - but finally, about about 12:30am, I got to the hotel. Fortunately, I'd called to confirm my reservation earlier that day, which was good as the man in front of me at the hotel hadn't called to confirm, and he was complaining while being ignored by the staff.
When I checked in, I was told that as the hotel was very full, I'd be getting a room with a murphy bed adjacent to a board room, and that I'd be moved in the next day or so. No problem, if it's got a bed, I'm just fine! However, when I got to the room, I couldn't find the bed. There was a table, and a shower, but no bed... I'm searching all over the place, thinking it must be there, but couldn't find it. When I finally admitted defeat and called the front desk, they found they'd sent me to the wrong room, apologized, and sent someone up to take me to the right room. Not a big problem, actually a bit funny.
It then took 2 tries to get a wireless internet ID number, as the first one I was given didn't work. The bed wasn't comfortable, but it was a bed, so no problem. I tried to stop by my room quickly the next day to drop off some materials, and found my card key didn't work. Went down to the front desk, found that they'd found me a new room - great, but I need to get into the old one now, and I've hung up my clothes. He scanned my card in and pushed some buttons, and I said that I'd see if I could move then or later, depending on time. I went back up two floors - and my card didn't work AGAIN. This time I was upset. Went back down, he apologized, and put my card through the machine again. This time it worked. He offered to have someone move me after I'd packed, but I decided it would be safer to supervise that myself - who knows where my things could have ended up? After another conference session, I went back, packed, and called down, and someone helpful came up and took me to my new room. I think they said something about a nicer room - it did have an actual bed, and a somewhat better desk, but I didn't see much of a change.
I did have a call the next day saying that they had me as checking out that day, was this not the case, and I had to correct that - apparently someone had entered something to that effect when I'd checked in, contrary to my reservation and my welcome card. My breakfast one morning had egg & bacon - but no cutlery - someone eventually came with the cutlery.
When I went back out the the airport, they got a taxi for me, and it turned out that he didn't take Visa - he said something about having told the person at the door, but they hadn't told me. Eventually he accepted a mixture of cash and a cheque.
"In summary - while polite, your staff perhaps would benefit from not making stupid mistakes. Having a bed in a room that you send someone to at 1am, giving out the right wireless ID code, not locking someone out of their room - twice - and providing cutlery are not highly technical customer service issues."
Added - I had a nice reply from them apologizing - "Overall, I can completely understand why we left you with such a poor impression and can only extend my deepest regret. I very much hope that you will accept a gift certificate for a return stay and allow us to demonstrate to you the service which guests of The Prince George expect." And if I ever end up in Halifax again, I'll have to consider it - but it's unlikely, given that I live on the opposite end of Canada!