I have only e-filed the Form 941 twice for a new client and each time I received the same message:"Our records indicate that an electronically filed return has already been submitted and accepted for this EIN, quarter ending period, and return type". This is definitely not possible because I am the only person who could file the 941. First time I just mailed it in because I very busy catching up from tax season, but this time I want to get this issue resolved. What contact number do I call at the IRS or from error message, do you know how to fix this issue? Please advise. Thank you.