Type And Earn — threatening and harassing, calls calls

Dear sir i had made id in quickr.com and from there i got a call from home at work online work and ask my id and adress then they send me some pdf files then they send online agreement and ask me to sign digitally fast. I had submit it and the executive told me to logged the site id when you start work. But i had not started work and not even open their id and after 1 week i got msg from their legal advocate and they said bcaus u had not done work u have to pay amount and asking for 20000. I request you to please solve my issue why should i pay when i had not even open their site
Please give a solution soon
And block them from making such problems.