Sandpiper Energy Solutions

I cancelled their service in July and had the hot water tank removed. They continue to bill me each month despite my emails to stop/investigate. They phone me to try and collect but phone number appears as an unlisted number (which you can not return a call to). I phone back to the number left for me but always get an answering machine and nobody returns my calls except an automated machine which asks me to press 8 to speak to an agent. When I press 8 to speak to customer service the line disconnects. Now into November, terrible service continues.