Need my money back

I have cancelled my policy with Momentum via Nadien du Plooy as we got a way better premuim with our previous insurance company. Another premium has just gone off so we have paid double for building insurance as well as short term insurance as this is with 2 different companies. I am a pensioner and cannot afford to lose all this money. I have been on the phone trying to get hold of someone at Momentum for 18 minutes without any luck. I want to get hold of someone who can assist me in getting my premium back.