Metropolitan Life refusing with my money

I cancelled my life cover with Metropolitan life months ago. But they however continued to deduct money from my account. I called them to request a refund. They asked me to submit certain documents including the bank statement which I did. Now when I make follow-ups about the status of the refund, they just ignore my e-mails. Its been over a month now and I am so frustrated because they were not supposed to deduct money from my account in the first place and when now when they are unwilling to refund my account. I am so disappointed with them.