For your own sanity, make a couple of febreeze bombs (air freshner cans with a zip tie over them, neutradol or oust would be best) and chuck them through the letterbox. Get a cooker hood filter with activated charcoal in it and tape it over the letterbox and any gaps around the door. Then tell the local authority you can hear a lot of flies to speed them up a bit.
Pretty shocking that nothing is being done quicker, but that is councils for you.
E: Don't use vicks, it will just open your airways more and let more of that stench in!
What do morticians use? Some of that, unless they are proper hard core and use nothing.
I'm no expert, but I'm not sure air fresheners bombs are the answer, creating a cloud of flammable gas when they likely have a fridge turned on might not be the best idea.
