Premium not being deducted after numerous requests...

I have been struggling with the company since end of May to deduct the premium and until now nothing has been done. I have called and my requests fell on deaf ears. My account was being deducted 3 days before my payday and when the deduction date came I received communication that my premium was unpaid and since then I queried this and tried to get it resolved. I even changed my banking details and instead an incorrect account was deducted a couple of days later. My problem is should anything happen to me I'll be told I'm not covered. This is really getting to me as I want to be covered but for some reason no one is willing to assist.