Continuing debit order after cancellation

My homeloan is cancelled wich also cancelled my insurance, but they still deduct money from me for the past 3 months. Try getting hold of them via email but only automated response. Is send all documentation to them wich clearly states everything. Can not reach them through phone only reach call centre wich drop phone when asking for assistance. I regret useing them for bond insurance and i would not recommend them to anyone.