Drainage system not draining onto enbankment

On the opposite side of the road to my property Butterbread Barn EX6 6JD is a drain on the enbankment to the A30 - a number of drains on the road and at the end of the crash barrier on the road drain to a brick ditch type drain - the pipes coming into and out of this drain are blocked - this causes this water to across the road overloading the same structure that is on the same side of the road as my property (see report ref - FMS3184709) to overflow and discharge the water and other contaminated products from the road (diesel, silt, debris) onto my property and is making my drive wet and unstable. Devon highways deal with the ditches and drains but as this forms part of the A30 enbankment they say that you have to deal with the issue - due to both sides of the road being blocked even small amounts of rain make the setup flood my property - this is now causing me great stress as my own drainage system is picking up the water and causing issues with my septic tank, obviously the water running down the road gets contaminated on route, this is on top of the fact that my drive getting damaged and washed away. It would be nice if someone could actually take responsibility and deal with the issue instead of passing the buck. It is only now that i have found out this part of the issue is Highways England - otherwise the issue has got worse over the last 3 years and is now unsustainable - I have cleared the actual brick structure my side of the road to help the issue - it was full of weeds and rubbish washed into it from the road but have been told that climbing over the crash barrier to carrier this out is not the correct cause of action. PLEASE PLEASE HELP thank you. I would have preferred to not report anonymously but there is not other option