Posted: 03/09/2014 at 20:15
Your neighbours by their actions are causing damage to your property i.e. your fence.
Whilst not a criminal offence, it is damage through negligence on their part. They are not allowed to pile soil against your fence without your consent or taking suitable precautions to guard against causing damage.
It is a civil matter actionable in the courts.
If you are on good or reasonable terms with them then it is preferable to talk to them about it and come to some reasonable solution.
I'd hope you could solve it amicably. if not you have grounds to seek redress in law.