Policy lapsed by skipping 1 premium then cancelled

Old Mutual has a tendency of just canceling policies without having their facts straight. One of policies 68176PO***5 which was on premium holiday cancelled. I have only skipped last month which will be paid this month. Am wondering why is the policy cancelled. Tried to call them several times but due to lack of airtime couldn't get hold of them. Can they please rectify the policy? Am really sick of tired of this insurance company. I cannot all the time report them they need to do thorough jobs. We are using money here.