Tickets haven't even been sold!
The loss incured by City fans occurs without even buying a ticket!
Spurs are up shit creak without a paddle and City are NOT going to bail them out if it.
If tickets haven't been sold, then they haven't entered into a contract with you. Much as I might like to take people to court for my business where people have let me down, without a contract, even verbal, the phrase "without a leg to stand on" springs to mind.