No response to cancellation of membership

Bloom health for me ,a member of the Momentum health insurance their billing team has poor customer service and never get back to clients and its clearly because they know we need to cancel the membership ,I have sent numerous emails requesting to cancel the membership however all I get is an automated message telling not to reply but no one gets back to me .I received a retrenchment letter all I'm trying to do is put my finances in order and they are selfish to respond to my phone calls or email as they don't want to lose a customer .People must not join this Momentum health for me cause cancellation will definitely be a problem