Insurance claim declined on gate motor

My Electric gate motor broke down on Sunday 10/05/2015. On Thursday 14/05/2015 the assessor came out to do an assessment only to be informed on 18/05/2015 that they do not cover this particular claim due to the electrical problem on the board occurring over a period of time, that is the excuse they gave me. The gate motor was working properly but on some occasions since January 2015 it would stop in the middle of closing and after 30 seconds would continue closing. As I said, not always! This also started to happen after December since they introduced load shedding in 2014, and in my believe was the cause for the problems on the gate motor board. I will not advice any one to do business with them as they seem not be willing to help their clients when in time of need!! I am feeling strongly about cancelling my policy with Nedbank and find greener grass on the other side.