Sds Solution — fraud company forcing to pay money

Dear sir/mam please help me to get out of this fraud as they gave me the online work and i completed the work on time but they failed my qc and most the pages showing only space differents and their edvocate is sending me the notice and asking me for 5400/- to pay even i did not sign any contract with them the bond they are sending me is without of my signature i m very sick of this situation kindly help to resolve this issue or suggest something. Email i’d :- digra. [protected]@gmail.com