Extremely disappointed customer

I have had an extremely poor experience to date with discovery. I am 5 months pregnant and I'm required to be on clexane medication due to previous thrombosis experiences. Clexane has been approved by discovery however each and every month when I need to collect new medication there's issues and discovery finds some reason which prevents me from getting the needed medication. I now get refused clexane due to the number of fills that have been exceeded however I have a prescription from the doctor confirming I need to remain on clexane for my full term. I also have confirmation from discovery who confirms my clexane is covered for my full term. I'm tired of waiting in long queues only to be told my medical aid does not allow for this refill of medication. This is causing undue un warranted stress during my pregnancy which is uncalled for. Each month I need to collect my medication each time I get refused dr different reasons. It's like discovery does t want to honour the commitment of my medication and wants to stress out pregnant women for no reason. Is this the way discovery treats all their pregnant customers in an attempt that I give up with all the hassle and stop trying to obtain the medication which I have been prescribed? Surely this is malpractice!!!! Extremely disappointed by Discovery.. I will be cancelling my contract due to undue regular stress discovery is causing me..