Your in Bangkok so have a word with your landlord and arrange for them to do the tm30 for you, also if the landlord is happy for you to do that then please ask him for the paperwork and the password to do it yourself
Why don't you just be honest about the overstay, or is that to much to ask we know your a bull shit blah blah blah, so go to immigration office and pay the bill and then you can sort it out