Send ammendment form but was never changed

I have a policy with Betterlife/ Altrisk. I recently changed my bank account and I notified Betterlife that I changed Banks. Johan Van Vuuren send me a amending on 20 February 2015. On the same day I completed the from and send it back to Johan via email. On Friday I got a call from Arthur saying that my policy is in arrears and that it will lapse on Friday. I now have to pay R500 and something for that policy just because Johan never send through my form with the updated Banking details. Is this now fair to me to be paying extra money just because my form never reached the relevant people? I made sure that my things was send through in time because i did not want to have any arrears.