Captcha — Captcha work fraud

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Hello, myself Isha and I recieved a call from this Gujarat based company called captcha and they told me I don't have to pay a single penny to join work and I have to complete 10000 captcha codes out of which 9000 should be accurate. Also I'll get 30k after completion out of which they'll deduct 6900 as their registration fees. It was my fault that I joined the work but after that they told me I signed some agreement which makes me pay them 3700 if I want to withdraw from work. I've researched a lot on Google and now I don't want to work anymore. It's just my day 2. And one of their workers had told me that I can withdraw from working earlier just that I shouldn't wait till last moment. So I told today and they're saying I have to pay them. Please help me before they send me any agreement. I'm just a student who was naive. Please help.