Dv Enterprises — sir error in work thus demanding money

Please sir help me this company is fraud and Sir error in work thus demanding money.and this company sand to me legal notice to my email id.sir i what do?.please find out sir.this is a harrasment to me sir please help me sir.and you told me i will not to sand money in onther account .sir i am midal calss man and i find to job.but currently not job to me ..so please sir