Discovery fails to pay for Clexane injections

I am so angry with Discovery medical aid,2013 they approved my use of Clexane injection to be used during pregnancy and now they coming with excuse not to pay for my injections as am pregnant again. 2013 Clexane injection use was approved with 2008 LANCET Lab results but now you dont want to approve it as to why I dont know. Knowing am a high risk pregnancy and I need inections to have a healthy baby. Without having Clexane chances of Miscarriage and still born are very high. Discovery do the right thing or you will also be famous for denying a pregnant woman necessary medication approval