I have been paying for life cover for my husband, for the past 3 years through a salary deduction and just suddenly they sent my husband a message that has policy has lapsed, he called them to find out what the problem is, but they still haven't given him

I have been paying for life cover for my husband, for the past 3 years through a salary deduction and just suddenly they sent my husband a message that has policy has lapsed, he called them to find out what the problem is, but they still haven't given him a reason for the lapse and they still haven't reinstated his policy. I don't understand what is the reason for this sudden action from Old mutual and feel rebbed by them.