Cheque bounce case

Total 5 members 1) aditya mashatty owner of aditya mahasheety gropus 2) arya rama chary owner of pencil studio 3) niklesh (college faculty of aditya mahasheety) 4)umesh nomula 5) chaitanya all the above 5 members are architects and designers . they got a interior designing project in Hyderabad .all of them being not highly experienced , they approached Mr nikilesh who has enough experience to handle the project .the complete financial accounts , cheque issuing authority ,ect were in the hands of mr nikilesh for the project . they started negotiation with all vendors like lighting , carpet , false celling , mansion work , etc etc and started the work at the site . carpet vendor mr.asif who supplied carpet flooring worth of 6 lakhs his cheque got bounced which was dully signed by Mr . niklesh . mr asif (carpet vendor) by misunderstanding might thought that all the 5 members are partners and filed a cheque bounce case against 5 members with arrest warrant issue . my questions are : 1) How can mr asif file a case against all 5 members when he has a cheque dully signed by only mr nikilesh ?? 2) It seems that if a company head do a mistake ,all the employees working in the company should suffer ?? 3) Can all others file a defamation case on mr asif , 4) As per some lawyers ,they suggested to go with recall petition coz arreset warreant is issued , why should we go to court leaving our business , why should we financially suffer by paying to lawyers ? 5) Can any one give me the exact suggestion so that we can fight against asif by filing defamation case is it possible ??