Inefficiency leads to risk on policy

I was required by my policy holder to draw blood for tests in August 2016. I followed procedures as it related to a change in my profile cover. I get a mail from the lab 18 months later to state that due to a technical glitch at the lab, my tests were never processed. this means that unbeknown to me, my policy did not cover me as per my agreement. However, the service provider has been deducting the increased value and have failed to notify me of this error.