No response to complaint

Mortgage Protection Plan. I called to complain that they deducted more than what they should. They told me that they will refund the one month premium. It have been over a month now and I have heard nothing and received nothing. I sent in numerous queries and complaints, but still no response. I am fed up with the bad services of this department. They just don't do anything. I want my one month's premium refunded to me as promised.