Harassment several years now

DMC for several years now have been periodically harrasing me claiming I have unsettled debt this morning I received a call from *** at 06h15 the operator refused to tell me who was calling until I had<br> Confirmed who I was above this several years ago they pitched up at my residence at 20h00 at night to deliver a document a month later a debit order was processed on my account turned out to be DMC I immediately disputed it. This is the last straw I am taking legal action I have been harassed and strange itc checks also have been done without my approval to here and no further DMC has caused me unessesary stress and sleepiness nights