Really bad back up service, no knowledge of products from the callcentre

Hi there, I have no problem with Momentum, they offer really good products. However when one wants to make a change it is like pulling teeth. I need to make a amendment to my Myriad policy, I have emailed, send a message with the Momentum App, no results. Please can someone contact me who knows how the product works as well as the Multiply discounts applicable to the policy.

Thank you