You might also like to try your council’s complaints procedure. Several times during my planning “process” I called the complaints department and politely explained my situation and frustration which resulted in an internal email copying line managers, department managers etc. This sped things up without actually making an informal complaint.
Got to say this does sound awful though! I struggle with a such an internal inflict when it comes to planners - sympathy (often massive case load, poor pay, no respect) coupled with complete contempt (capricious, officious, incompetent, unimaginative).