In my experience, this is a solid hotel. But it surely sounds as if they dropped the ball time and again with your stay. Good Grief.
I cannot fathom being presented with a $500 bill for finding an unopened cigar in the room. That's 2 miles past preposterous. In fact, I'm sure that will be the craziest thing I hear this month. If indeed no smoking took place in that room and the hotel won't listen to reason, I'd say this is another topic to take up with SPG Customer Care.
Wow.
To the OP: is there any more to this story? A side that we haven't heard? My experiences here have always been solid, so yours just seems incredibly different from mine. Understand, I'm not challenging you at all -- just seeking to find if you think the hotel might have a different version. Thoughts?
Good luck getting all of this sorted out. Yuck.