Vodacom cancels my insurance unilaterally

For the second time in a few months, Vodacom Insurance has cancelled my insurance on my device. This is not on my instruction or for any given reason. <br> <br> It happened previously, apparently due to a 'systems glitch', and I had to chase the query repeatedly to resolution.<br> <br> I would like my insurance reinstated, I would like an explanation on this occurrence and I would like to know how it will be prevented from happening a third time.