Q: My research has been published in a predatory journal

Detailed Question -

Fresh from graduation, I submitted my paper to Pediatrics and Therapeutics, a journal by Longdom Publishing. My paper got accepted only to find out that it is a predatory journal/publisher. They demanded me to pay 1800 euros which I said I cannot afford. I'm from a low to middle income country and its not possible for me to pay the amount. I never agreed or signed anything for them to post my research online but it was already posted. I asked them to take it down and I'm retracting my paper which they refuse and demand that I pay the fee or they will seek legal action. What do I do?

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