My next door neighbour has posted a letter through my door which is accusatory and threatening. They have accused me of contacting social services on seeral occasions, being obsessed with her family and harrasing them over a crying toddler. They have even gone as far as saying I tried to enter their house because I knocked on her door and asked if everything was ok when I could hear their toddler screeching through the walls!! She has also written that they will be contacting legal representation for a restraining order against me for harrassment if my obsession with them does pnt stop! Now, I haven't uttered a word to this girl since the day and hour they moved in (over 3 years ago) and don't even know her name, yet she knows mine? I have heard her partner beating/slapping their toddler and her older son has admitted that his father beats his younger brother 'hard''. One day I could hear him actually beating the toddler and him screaming and crying for it to stop, so I shouted over my back fence for him to stop - that was it, no response, no nothing - until now. Please any advice is gratefully received, I really don't know what to do from here? I haven't acknowledged receiving the letter, or done anything. What should I do??