Let me try to rephrase what I said earlier:
If you compete on price, then you are mining for bargain hunters. And bargain hunters can be the most entitled, demanding customers. This is true across many industries. I remember a hotel receptionist saying that people who got a cheap room rate were more likely to complain than those who paid significantly more. I remember an article by online retailer saying that when he tried to compete on price (he sells linens), the thin margins were eroded by people complaining and demanding refunds over spurious things. I just googled "bargain hunters demanding customers" and found a great article on it: search for "Nicholas Reese Problem Clients" and you'll find it.
But, simply raising your rates won't be enough to change things. You have to figure out your niche. It's not enough to bung up some selfies of your tits and expect the phone to ring. You're competing against thousands of other escorts in greater London. You have to figure out a way to stand out. You have to package your special appeal and market it. It can be hard to do. I have a friend who is brilliant at deep throat. It's what she markets and she has big demand. I wish I were, too! But I have managed to figure out one or two things I'm happy to do that not everyone is (safe, harmless things) and I big them up. I also play up my ethnicity, my height, and my age. These key things are front and centre.
It can be harder if you're one of hundreds escorts of a similar age, dress size, and services. It may not come easy - but it's worth working on and figuring out what you can do to set yourself apart.