IMO, pl stop fretting - it may be difficult, but you've been told the procedure by posters, so pl wait for it to grind on.
If you made a properly completed submission in time to TEC-by ticking the box as advised, signing and sending to the address as directed on the form - then what follows is automatic and mandated under the regs, TEC has no discretion in the matter: the Order for Recovery will be cancelled, the Charge Certificate similarly and then the ball is in TfL's court. If they wish to pursue the penalty, they must refer the matter to the adjudicator for directions. No ifs or buts, it's automatic.