If the situation is as you describe, sending unsolicited email and then charging you for receiving it (that's essentially what you're describing) when you have clear evidence you hired via the prior contact with another agency (they have that documented, right ?) is something which can be easily fought - albeit in court with some initial costs if they're going to be ass-ish.
You would win both your case and the legal costs if things are as cut and dried as you suggest.
However, if you replied to the unsolicited email (establishing you saw it) and there is no evidence of the prior agency being before that, you have a more difficult case. My personal experience of two agencies being involved was that the agencies sorted it out amongst themselves how to split the single fee which was paid to one of them - this was in the UK as you seem to be.
Only an experienced lawyer familiar with the details of your situation can properly advise you. I'm curious that you've been advised to settle if you've consulted a lawyer and appraised them of the situation you describe. Normally lawyers like slam-dunks like this.
My experience is recruiters don't send unprompted candidates because, without a prior agreement/contract, they will have difficulties in establishing they made an initial introduction and hence qualify to get paid. Otherwise they can just mailbomb you with millions of name variations and claim they introduced you to everyone on the planet and you owe them $$$$$s. [I think you realize this with your 'proposed' new business venture. ;-) ]
If the situation is as you describe, sending unsolicited email and then charging you for receiving it (that's essentially what you're describing) when you have clear evidence you hired via the prior contact with another agency (they have that documented, right ?) is something which can be easily fought - albeit in court with some initial costs if they're going to be ass-ish.
You would win both your case and the legal costs if things are as cut and dried as you suggest.
However, if you replied to the unsolicited email (establishing you saw it) and there is no evidence of the prior agency being before that, you have a more difficult case. My personal experience of two agencies being involved was that the agencies sorted it out amongst themselves how to split the single fee which was paid to one of them - this was in the UK as you seem to be.
Only an experienced lawyer familiar with the details of your situation can properly advise you. I'm curious that you've been advised to settle if you've consulted a lawyer and appraised them of the situation you describe. Normally lawyers like slam-dunks like this.
My experience is recruiters don't send unprompted candidates because, without a prior agreement/contract, they will have difficulties in establishing they made an initial introduction and hence qualify to get paid. Otherwise they can just mailbomb you with millions of name variations and claim they introduced you to everyone on the planet and you owe them $$$$$s. [I think you realize this with your 'proposed' new business venture. ;-) ]