However, I got a copy of my resignation without sign from my superiors. Aug 18, they advised that our HR wants to talk to me. Spoke with our HR, explained my plans and all. He clearly stated that they will get it touch with me as soon as possible regarding my resignation. 4 days prior to my last day, I haven't received any feedback. Even my supervisor informed me that Sunday would be my last day. On my last day Aug 21, I sent message to my Manager through FB msgr, thanking for everything and got nothing on response. Sept 3, got a letter from my previous company, "a return to work" letter. Asking to go back render 30 days or else they will charge me 100k. I even asks my supervisor where do I need to go, he said I need to go directly to HR.