You need to email your local MP that deals with your immediate area, i went through this.
Basically there's a network of tiny lanes all around my house, one of which acts as a handy shortcut to a granite quarry, cue huge dump trucks using it when they shouldn't. Huge holes started appearing and averaged the size of dinner trays and at least 10" deep. on small lanes they were toally unavoidable.
i contacted local council, did a few laps around different departments and got nowhere. 1 yes just 1 email to my local area rep (happened to be lib dem) and i got a reply saying basically leave it with him, cha right i thought. i no longer have the email as it got sorted but basically about 2 weeks later the reply stated that after communicating with the council and parish council and with the quarry the situation would be resolved.
and it is. the lorries still use the lane, with conditions that when holes appear they have to repair them along the route, and as the quarry does all aggrigates they use tarmac too. couple of times a week they cruise all of the surrounding lanes and repair them. now when us locals meet these trucks on the small lanes we no longer hate them for making us reverse a million miles to let them pass
maybe its just local cornish community rules in action, or a very good mp, either way 1 email was all it took after weeks of getting fobbed around
not sure who your local one would be but worth a try, you might be surprised
its although worth mentioning that if your car gets damaged on a pothole, stop, take a photo of it. then sue your council who will by law be responsible for the damage (this also applies to speed humps being too high as long as your car is standard)
they get sue'd enough times then they will repair it as its a cheaper option that compensation payouts will be, different roads have different repair schedules and maintainance forecasts, and get prioritised accordingly, unless damage appears they make take along time to get around to it if they are unaware of any repairs needed or there are more important routes to be done