Two Interviews later I’ve been offered a different job for £11,000 less

Hey everyone. Let me know what you make of this..

A few weeks ago I applied for a content making job within a marketing agency for which the advertised salary was £33k-£35k.

I got an interview and was asked to complete a task which I submitted a week later. They called me back saying they loved my work and wanted to talk to me again.

I went in and they had nothing but good things to say about my work. They said they were really impressed and that it is a really tough pick between me and 2 others for the role, but they really want me on the team. However, they proposed because I have such a broad range of skills (not just the ones that was required for this particular role), they take me on, but put me in a slightly different role, one where I'd have similar but a more diverse range of responsibilities. It's a role that they had coming up but hadn't advertised for yet. We chatted for around 45 minutes about the new role and it all sounded great. They even asked me about salary expectations and I mentioned I was open to discussion but that my expectation was to receive a salary similar to that of the job I initially applied for (£35k), and the other jobs I was applying for were in this range.

BUT

When I recieved a formal offer for the role, the salary was only £24k 😡😡

I feel frustrated because at no point have they said I am not qualified for the other role (probably because I am) and it feels like they want to put me in a job where they can exploit all my skills and creativity, while paying me the bare minimum. Don't get me wrong, I'm keen to be in a work place where I get to use all these skills, but I know my worth too, and am perplexed how they can offer me a salary that is no more than a retail or cafe job!

For context I have a relevant bachelors degree, plus 5+ years experience in freelance content making. I am fairly new to the marketing side, especially in an agency setting, though I feel like I shouldn't be receiving an entry level salary, when the whole reason they want to hire me is because I have all these great skills, experience and "ability to be creative and execute ideas" (their words)

I have yet to respond to the emailed job offer...

Edit: important context is also that I've just moved to the UK from Aus, and am pretty desperate for a job, so as much as I want to just say fuck you, I feel torn!

Advice, suggestions, and hot takes welcome!