You'll get more help if you don't come across as a mythical Norse being in your first post.
Who are these people that claim to offer anal but don't when you show up? Post some reviews, name and shame. We need to know if they're only saying no to you but happily spreading their cheeks for other punters. Or if you are what you seem to be.
Once you have a girl in mind, it's simple enough to read reviews here or aw to find out about their service.