Zero Regard for Marketting or Opt-Out

I have registered with the DMA, yet you do not regard that at all. Had 2 calls in the last week and everytime I advise the agent that they should not call me, before I can even ask them to remove me from their database they put the phone down in my ear. What kind of customer service can you expect from a company that can't be bothered to even employ fully trained call centre agents?